Except they're not

Where does 2.5 years come from. Ps2 launched in Oct 2000 in na, and Xbox in Nov 2001

Really? What about DS vs PSP?

And the Wii U is doing it right now. Have a look at the Weekly Hardware Comparisons tool, and look at Wii U sales relative to the other two (remove all of the other systems, and look at the time since launch of the PS4 and XBO).

In fact, prior to the end of May, the Wii U had only a total of three weeks of sales higher than 50k that didn't lie between the 27th of October and the 11th of February. Those three weeks were the weeks ending March 23rd and 30th and October 5th, 2013. These correspond to the week of the release of Monster Hunter 3 Ultimate outside of Japan, the week following that (we'll assume this bump came from the MH3U bundle), and the week that Wind Waker HD released. The vast majority of other weeks were around 30k a week.

Since the release of Mario Kart 8, however, the Wii U has had six weeks in a row above 60k a week, with the last three all sustaining sales a little above it (thus demonstrating that it's not still decaying), without any sort of price cut and without any notable other game released within that period. With the exception of that second week for PS4, when it was out of stock in most places, thus depressing sales for that week (resulting in the Wii U outselling the PS4 that week), the PS4 has almost always held a more than 100k lead on Wii U in weekly sales, and has always held a lead of at least 70k... until the end of May. With the release of Mario Kart 8, the furthest that PS4 has gotten ahead of Wii U is 45k, and in that period, the PS4 got Sniper Elite 3, EA Sports UFC, MotoGP 14, Murdered: Soul Suspect, and Watch_Dogs, all of which charted (with EA Sports UFC and Watch_Dogs being games that topped the chart for their respective weeks), while the Wii U got... Mario Kart 8. One game. There were only two other retail releases in the period, How To Train Your Dragon 2 and Transformers: Rise of the Dark Spark, neither of which managed to even appear in the top 100 in the week of release.

So basically, with one game, the Wii U doubled its baseline weekly sales, brought it from a point where it was selling far worse than the other consoles to a point where it's matching Xbox One and not that far behind PS4.

What happens when the Wii U now gets Smash Bros, the other highly-anticipated game that has a lot of people planning to get a Wii U (but not getting it until the game is released)? In the meantime, what happens when the ultimate fanservice Zelda title, Hyrule Warriors, gets released? Or Bayonetta 2? Or Fatal Frame 5 in Japan? If one game can have such a significant impact, what happens when high profile Wii U exclusives are released in a shorter period of time?

And for anyone who is thinking of saying something like "When the Mario Kart 8 promotion ends, the sales will drop", I'm going to point out that Nintendo aren't forced to not do anything else until the release of their next game; if a deal like that is what it takes to keep the system selling, they'll introduce more, similar deals. So even if you're right, and the Mario Kart 8 promotion is why sales are staying so high, then all it takes is Nintendo having another such deal.

This thread was made to early. Things look to heavily favor Ps4 by the end of the year. And that's just over a full year on the market.

While all that is true you must also take into account the fact that the XB1 and PS4 are currently outselling the Wii U with higher prices and none of their big titles released as well. And while the impact of MK8 was significant without much 3rp party support the sales will indeed declind maybe not to pre MK8 levels but they will indeed go down because there are not a lot of BIG games coming out like SSB, MK8 etc consistent enough IMO.

So it is definitely an uphill battle because the cards are currently favoring PS4 and XB1 who can still do price cuts and have yet to really release ANY of their BIG releases. But time will tell how things will play out. 

The argument can be made in reverse, though. Wii U is selling nearly as well as PS4, and about equal with XBO, despite having no real third party support, only one notable game within a six month period (the only notable release between DKC:TF in mid-February and Hyrule Warriors in late-September is Mario Kart 8), during a period of general low hype (due to performance in 2013)... and despite the system still being at full price (which is the highest price Nintendo has ever had for one of their consoles).

And while there's not as many "BIG games" coming out, they're actually quite a bit more diverse. Bayonetta 2, Hyrule Warriors, Smash Bros, Captain Toad, Sonic Boom, Watch_Dogs, and Fatal Frame V makes for a remarkably broad lineup, with the only non-exclusive on that list being Watch_Dogs (and you might view Smash Bros as non-exclusive, although Sakurai considers the 3DS version to be different from the Wii U version, with just the rosters being the same). Now, how many Xbox One titles are releasing by the end of the year that are neither FPS nor also available on Xbox 360? That is, non-FPS titles that you need an Xbox One (or PS4, or PC) to play. And how many of those would be called "BIG" games? If you do the same thing with PS4, the list wouldn't be much longer.

This isn't to diminish their lineups. They're getting a solid lineup of games, without a doubt. But it's a bit disingenuous to imply that the Wii U has very few good games coming, and the PS4 and XBO will have so many huge games as to completely dwarf the Wii U... especially once you consider overlap between fanbases.

Maybe someone else said the bolded because I didn't lol just wanted to clear that part up.  And the lineup of the Wii U being more diverse is actually not true either seeing as both the XB1 and PS4 have just as diverse lineups(LP3, DriveClub, the next dynasty warriors/samurai heros games(which is kind of what Hyrule Warrios came from), TLOU remastered etc for PS4. Now I am not as good with XB1 but I know they have Forza, Sunset overdrive, Halo MCC etc. And those games do not include all the 3rd party games which still matter whether they are on PS3/PC/Xbox 360 etc. So all 3 systems have VERY diverse lineups. But I see your games list is only talking about the rest of this year I was speaking more in general as far as long term goes when I replied. When it comes to exclusives any gaming fan knows that NIN will always have the edge in the number of exclusives so no argument there. 

Also with your argument the Wii U may not have had any other "big" games come out recently bar MK8 but they have had much more time on the market and as far as Meta goes anyway have the superior library of games AND have more games than either the PS4 or XB1 and to only manage to sell close to and a little better than the PS4/XB1 with all those advantages is cool but you would think it would be selling more. 

Now do not get me wrong I am not dooming the Wii U or trying to downplay it I am just looking at how things are currently going. Of course things could change and the Wii u could explode in sales but currently while sales have indeed picked up it just seems as if they should be much higher. 

First of all no games and yet PS4 stays on top. All big titles slated for 2015. But there will be a big bump around this holiday season and one for TLOU remastered.

You didn't say what was bolded, you implied it, hence why I used the word "imply". And you did so here: "but they will indeed go down because there are not a lot of BIG games coming out like SSB, MK8 etc consistent enough IMO." - by suggesting that this would apply specifically to the Wii U as a reason why the PS4 and XBO are going to do better than Wii U, you're implying what I said in the bolded section.

Regarding Samurai Warriors 4 (which is the one that's releasing later this year for PS4)... here's the thing. The Samurai Warriors series isn't all that strong outside of Japan. The first Samurai Warriors, for PS2, sold 220,000 copies in the US, with the next best not even breaking 120,000 (and that was the recent 3DS one). Dynasty Warriors, which is the one that Hyrule Warriors is directly based on, has done a lot better. Samurai Warriors 4 is only going to do well in Japan. On the other hand, Hyrule Warriors is going to appeal to all of the Zelda fans, with a game that is filled with fanservice and content drawing from all of those popular Zelda titles. We've got Zelda (in a style reminiscent of Twilight Princess) wielding the Wind Waker against foes from Skyward Sword while Midna pulls the Moon from Majora's Mask down on redeads. And it's likely that, for the first time, people will be able to play as Ganondorf in a Zelda game.

You mention LBP3, Driveclub, and TLOU Remastered. The thing is, LBP3 is also releasing on PS3 and TLOU is already out on PS3, which just leaves Driveclub. And Samurai Warriors 4 is releasing on PS4, PS3, and Vita. So out of the four games you mentioned for PS4 that weren't FPS, three are or will be available on PS3.

Similarly, for Xbox One, you mention Forza, Sunset Overdrive, and Halo MCC. Now, Halo is an FPS, so we'll drop that for a moment. Forza Horizon 2 is also releasing on 360, leaving Sunset Overdrive. And now you have Driveclub vs Sunset Overdrive.

The reason why I brought up games not available on 360/PS3 is that games available on 360/PS3 don't provide enough motivation for people to upgrade. If you can get LittleBigPlanet 3 on PS3, there's less reason to upgrade to a PS4 for the game. So it's going to primarily be the games that you can't get on the previous generation that will drive adoption of the new systems at this point (most people who wanted a PS4 or XBO for their raw capabilities got them early).

You are right that the Wii U has a larger, stronger library... but it didn't help it in 2013 when the library was being formed. The change, the start of the turning of the tide, happened with Mario Kart 8. A turning of the tide always requires an initial push. For the PS3, it happened in late August 2009, when the price was cut to $299, a cut of $100 at the time. In the months prior, the PS3 was selling about 100k per week. The worst it saw between the date of the price cut and the end of April 2011 was 144k. It wasn't just the price cut, overall, but the price cut was the tipping point, the push that began to turn the tide.

The tide gets turned when people begin to see the system as being worth the current asking price. For the Wii U, Mario Kart 8 has done it for a fair number of people, it seems. It's not enough, yet... but it's the starting point.

Consider something. The PS4 game you thought of that isn't on PS3 as well was Driveclub. A racing game. PS4 also has MotoGP 14 and Need for Speed: Rivals already out. Compare with Wii U, and ask yourself - does the Wii U currently have a game like Smash Bros? Like Hyrule Warriors? Like Bayonetta? Like Fatal Frame? Like Sonic Boom? All the big games coming to Wii U bring something to the system that it didn't already have. It's no guarantee, but with a solid push by Nintendo, it could result in much stronger Wii U sales.

Something to think about - yes, there's a gap in the lineup between now and late September... this would be a good time for Nintendo to go for a $50 price cut, if sales start to peter out again. Or they could start offering bundle deals. And since the Wii U seems to have stabilised pretty well, I don't think they're going to need it - I think they'll be able to hold off on a price cut, and instead go with a big Smash Bros bundle that comes with the GC adapter, a GC controller, a few Amiibos, and a code that permits download of one of the other big games already out (kind of like the MK8 deal), allowing them to hold off on a price cut until next year (timing a price cut to coincide with the release of Splatoon would be a good idea).

All excellent points and VERY well broken down. And my statement in NO WAY implied that the Wii u doesn't have very many good games coming out. It meant exactly what it said BIG games like MK8, SSB, Halo 5, Uncharted 4 THOSE are big games that seem to move systems. I CAN NOT wait for Hyrule Warriors and love the Dynasty Warriors/Sengoku Basara/Samurai Warrios game series. I am also super hyped to try out Fatal Frame. And as far as games coming to ONLY the Wii u there is NO argument there at all. The Wii U will ALWAYS have unique games coming to it. And I agree the Wii U could indeed get much stronger in sales and I have no doubts that it will but with the current situation it is indeed an uphill battle. 

While the PS4 has multiple FPS games, racing games, fighting games, RPGS etc that is still a selling point because it gives people options on which game they can choose to play. While the Wii U doesn't have a lot of "options" on those games it is also a selling point because it gives the NIN fans what they want in those particular games.. AS far as turning tide goes the Wii U will also indeed have that but so will the PS4/XB1 the sales for the two of them will not peak for another 2-3 years. And they will also increase in sales...so unless one of those two the Ps4/XB1 just completely drop hard in sales the current situation won't really change all the systems will just be selling more units. 

And again just to make it clear I am in NO WAY dooming or down playing the Wii U. I am just looking at things overall. I personally think the Wii U is a VERY good system with some very nices games out and coming. Even being more of a PS fan and preferring PS games I  still know that much about the Wii U. I am not saying it will fail or fall off just saying that it has a VERY tough battle ahead of it if it is to ever outsell the PS4 or XB1. And it has a VERY strong chance of passing the Xb1 because they are basically even  in Europe, it destroys the XB1 in Japan of course so NA is the only REAL advantage the XB1 has over the Wii U IMO.