Now I think what Microsoft will do is push Halo 5 as its going to be the only titan to be present in Christmas (For now)

Holiday season 2015 sure, at least in terms of big name games. Not convinved about 2016. Sony already have Uncharted, Wild, God of War, Street Fighter V, probably Gran Turismo 7, Horizon. Stacks up well against Gears 4, Quantum Break, Scalebound, Crackdown and another Forza. Don't see MS having an E3 so much better than Sonys that you could say they have anything in the bag. Sony have more studios with no firm announcements than MS do after all.

Nintendo are not looking great for next year right now aside from Zelda, and this NX rumours put a lot of stuff in the air. Maybe Retro's next game will be ready for the end of the year, maybe they will have some kind of Mario remaster. Or maybe those games will be on a new machine. 

Mario Party, Splatoon and XX will have to make Nintendo fans needs in gaming for the rest of the year then.

...none of this post makes an ounce of sense.

Sega Genesis released 3 years after Master System

Nintendo DS released 3.5 years after Gameboy Advance

Xbox 360 released 4 years after Xbox

In all these cases the successor went on to be the consoles makers biggest success story ever.

For a system selling as bad as Wii U, it's gotten a ton of support from Nintendo. Compare the Vita, which Wii U still hasn't beat to date but Sony stopped caring about almost entirely after year one.

The Saturn is no comparison. Wii U - Saturn would be a comparison if this system had basically none of the Nintendo mainstays on it: no Smash, no Kart 8, no 3D World, just a bunch of odd games like TW101 and spinoffs like Hyrule Warriors. Basically Sega ran not one, but three consoles in a row that they barely supported due to a lack of cohesive strategy (CD, 32X, Saturn).

And none of that stopped the Dreamcast from selling like hotcakes until Sega had to pull the plug. System has still outsold the Wii U ltd, and that will only change at the end of this year (and then, only if Nintendo has something to anchor the holiday). The problem was Sega's need to compete with Sony and the fact that Sega was out of money from the aforementioned 3 bungled consoles in a row, giving them no room to take short-term losses in a fight against the PS2.

I'm terms of Nintendo published titles, Wii U is on track to matching N64/GC output, Nintendo hasn't snubbed anyone.

Also why do people want a 5th year that never gets relevant support?

What did N64 get in 2001? Pokemon Stadium 2 & Paper Mario

What did GC get in 2006? Twilight Princess

What did Wii get in 2011? Skyward Sword & Return to Dreamland

The last 3 Nintendo consoles have gotten 4 years of support, why not just cut off that 5th year entirely?

Tough news to take but in the end, we all know it'll be worth it.

Everything was 2016.

Each one of those is from a console that launched later in its respective gen, with the only exception being the DS, which really only launched so early because they didn't want Sony to take over the handheld market like they did the home with the PS1.  So, it's not really surprising they would have a shorter timespan before a successor launched.  It's also important to note that the Master System and Xbox were Sega and MS's first real attempts at console gaming.  We're talking about a console that launched a year earlier than its competitors and after a highly successful system.  The Wii U's situation would more closely resemble the Saturn's.  Launching ahead of its competition and after the highly successful Genesis.

The real problem Nintendo faces is that it's home consoles have been declining in demand among core gamers from the beginning.  NES 62M > SNES 49M > N64 33M > GC 22M.  Wii U may continue this trend and sell ~20M, less if they jump ship early.  The only exception to this trend was the Wii.  But that had the added benefit of taking advantage of the growing casual market, something that has, for the most part, either gone to cell phones or just stopped gaming, and is not coming back.  And its success definitely did not stop the success of the systems more focused on core gaming.

If Nintendo was smart, it would just abandon home console gaming and stick to handheld gaming, focusing all of their major exclusives on 3DS2.  Or if it wanted to put out some more ambitious titles, occassionally dabble in 3rd party publishing.