The problem is that Wii U 's fourth year  will be like the GC fifth year.  The Gamecube was also killed early but for a reason, the Gamecube was itself a late release compared to the PS2 and had massively suffered from that.

The Wii released in time with the PS3.... The Wii U released one year before the other consoles. Not the same situation at all.

Consoles lifes are expanding toward 7-8 years, and Nintendo is the exception, with the Wii U lasting only 4  years, with only 3 years of support.

Bottom line:

- The Wii U is the most expansive Nintendo console released

- It's also the least supported in number of games and time of life

- The Wii U will be my least played console and the one where I will hold the less games ( only 7 games so far including one given for free) compared to the other Nintendo consoles.

I would have liked a Paper Mario, a Super Mario 64/ Super Mario Sunshine exploration/collect-a-thon based 3D platformer, a 3D Metroid game, and a few other console defining games like maybe Kid Icarus HD, or Luigi's Mansion game, or some other surprise.

With that being said though, I have nevertheless really enjoyed the Wii U and, with the situation considered, I appreciate that Nintendo supported the system with some really great software. More specifically I really enjoyed and continue to enjoy Mario Kart 8, Super Mario 3D World, Xenoblade Chronicles X, Bayonetta 2, Zelda WWHD, Hyrule Warriors. I am also looking forward to getting Splatoon and Mario Maker at some point and I am anxiously awaiting the release of Zelda U.

For me the Wii U will probably be my last home console for a while because I really do not have the time anymore. So personally I am more interested to see what the follow up to the 3DS/New 3DS will be.

Actually, if the NX is Backwards compatible, what they should do is to offer a digital copy of one or two WiiU games. Those titles are ones whose sales are going to go down when the NX comes out, but they still are big incentives to purchase hardware. They get new games and keep the interest for new NX software high.

This is what I think.  Bare minimum for me is that the NX has to have a unified library.   If there's only a minor power upgrade (like the equivalent of around the xbox one) and no means to future-proof the console version against the PS5/xbox2,  they might want to consider offering a discount or freebie to everyone that bought the Wii U considering a lot of them might feel ripped-off or betrayed.

If Nintendo properly kills the Wii U, then...sure.

I mean, it's not like I got it at an expensive price. I got it for 300(and it came with Mario kart and another free game of choice). And there's enough exclusives for me to slowly buy at a lower price within the next 5 or so years

People want them to... Yet they don't realize the NX if released in 2016, assuming it's a home console will be in the same situation as the Wii U. Hardly any first party support. And according to their statements they are going to keep supporting the Wii U and not abandon it, which I'm assuming makes it so the Wii U will be supported into its 5th year.

The NX needs to be successful, so shouldn't they wait another year until they actually have a solid launch lineup and more time? That sounds better to me personally.

If the Wii U had two more years and a true price drop, it could have reached gamecube levels.

They released a console at premium price and now they are burrying it.  There is nothing next year except Zelda (potential multi platform with NX) and Starfox.

I bought the Wii U at MK8 release but for the NX I may wait longer if they don't kill the system 6 months after. In my opinion Nintendo should have assumed the Wii U 1-2 years more.

It's pretty hard to say Nintendo didn't give adequate support to Wii U during its lifetime, here are the games published by them.

New Super Mario Bros. U
Nintendo Land
Sing Party
Lego City Undercover
Game & Wario
New Super Luigi U
Pikmin 3
Wonderful 101
Pokémon Rumble U
Wii Parry U
Wind Waker HD
Super Mario 3D World
Wii Fit U
Mario & Sonic Sochi Olympics
Wii Sports Club
NES Remix
NES Remix 2
Dr. Luigi
DKC: Tropical Freeze
Mario Kart 8
Pushmo World
Hyrule Warriors
Bayonetta 2
Super Smash Bros. Wii U
Captain Toad: Treasure Tracker
Kirby & the Rainbow Curse
Mario Party 10
Mario & DK: Tipping Stars
Splatoon
Art Academy: Home Studio
Super Mario Maker
Yoshi's Woolly World
Fatal Frame: Maiden of Black Water
Mario Tennis: Ultra Smash
Animal Crossing: Amiibo Festival
Xenoblade Chronicles X
Devil's Third
Twilight Princess HD
Star Fox Zero
Pokken Tournament
Mario & Sonic Rio Olympics
SMT X Fire Emblem
Legend of Zelda U

I am a bit disappointed about the lack of a Metroid or Paper Mario, but overall I think the Wii U experience has been completed by the presence of new additions.  Nintendo has given us quite a few great new additions that we haven't seen on recent consoles: a great Yoshi Platformer, an amazing new first person shooter IP, a Mario level-creater, Pokken Tournament, NES Remix, etc...  I do think that once we have Star Fox, #FE, Pokken and Zelda U the Wii U will have a full console experience (at least excluding 3rd parties) that is close to what the 5-year consoles had.

So, in short, no I wouldn't be upset if Nintendo moves away from the Wii U after releasing the titles they have committed to in 2016.