If nintendo was right, they will sell 3.6 in 2014, but it wont be the peak year.
so, 2015.

The WiiU sold incredibly poorly this year until Kart, it will definitely be cheaper at some point next year and will have amassed a nice library of games to go along with new releases like Starfox and Zelda. Also, games like Mario Maker and Splatoon could have a nice effect, not to mention something else unforeseen.

Although its 8th gen competition will be even stronger next year, I'm going with 2015.

There is quite a bit evidence to support 2014 to be the peak year. It's all in trends of console sales, game releases, Nintendos business practices 

I'm sure the Wii U will outsell GCN

who knows a price cut to $199 in 2015 along with a steady stream of exclusives could cause it to outsell 2014. Not saying its a given but certainly possible.

Both Wii sales and shipments peaked in calendar 2008.

As for the topic, before E3 I probably would have said 2014.  However, the lineup for this year has remained pretty sparse.  With most of their announcements being 2015, and another long drought after MK8, it seems feasible that 2015 can surpass this year.

Price cuts, and any further delays can also cause a large impact.  i.e. no price cut this year, but one next year.  Or Smash Bros getting pushed to early next year like what happened to Brawl.

How many people think Zelda will actually release in 2015?

What about Starfox?

Good points -  Nintendo def NEEDS Zelda in 2015 and in the 1st half 2015 at that-   If it goes to 2016 that willl really take the wind ot for them in 2015-

Re Starfox it sounds like they are not even sure it will be a stand alone game and def in early stages either way

I really hope that starting this fall they can keep the release momentum going w some amount of consistency-  no multi month droughts -

about the same.

The sad truth of the wiiU is that no console can survive on exclusives alone. A lot of people either buy a console for "the one thing" or they buy it for "a lot of things". In the case of the wii, a lot of people bought it cause the whole motion gaming thing caught on. Unfortunately for nintendo, a majority of those people were the casuals. They are gone now, and all nintendo is left with are the true nintendo fans.

Nintendo can this only sell their console to people that want nintendo games, cause if you want anything else, its going to be on another platform. Question is, how big of a fanbase does nintendo really stil own. Cause I sure as hell would like them to put their money where there mouths are and help nintendo buy the wiiU. Nintendo can release every major title it has to offer, it still will not be able to command sales of more than 25-30M lifetime. To sell more, it needs the other games.... the multiplats.

I can make that prediction right now, though, if I want to. I don't think any amount of Nintendo games announced for 2016 can change the fact that interest will wane by then, and competitor's hardware will be cheaper than now while recieving many more popular games.