You have to give a fairly big list of games. That are: 3rd party, haven't been gimped, in some way. IE: Missing DLC, patches, launched at the same time, complete compared to another consoles version. Can use normal controls. And not forced to use the gamepad. To really say this. Because for me. I'd damn well would buy 3rd party games on my Wii U. But I can't. Because of the reasons above.

So what 3rd party games have you bought on the WiiU?

I just stated above the reason why i haven't bought them, on my Wii U. Give me a list of games that prove your side. I couldn't even buy Shovel Knight on Wii U. Because stuff was only avalible for its dumb amiibo.

Does it need a 4kUHD drive also?

3DS third party support is not great.  It's ok.  Compared to the XBox One and PS4, third party support is really slim.  If this is going to be Nintendo's home and handheld system, 3DS levels of support are not enough. 

And the Wii U would have definitely sold far better with power on par with the PS4 or XBox One.  There are tons of people, particularly kids, who like Mario and Pokemon but also want GTA and Call of Duty.  And third party games do sell on Nintendo systems under the right circumstances.  Of about 160 games to break a million on the Wii, about 130 were third party games.  

One of the most important things though, is that nobody is expecting Nintendo to match cutting edge technology.  The XBox 360 and PS3 were very advanced systems for their time.  The PS3 CPU and the XBox 360 GPU were close to the top of the line at that point, at least when it came to consumer grade products.  The PS4 and the XBox One were not cutting edge when they were launched, and the NX will be launching 3 years later.  Getting close enough to the PS4 to ensure third party support should be a given.  Nintendo shouldn't be a generation and a half behind.

ZombiU, Rayman Legends, Deus Ex: Human Revolution - Directors Cut, DuckTales Remastered, Legend Of Kay Anniversary, Resident Evil: Revelations, Need For Speed: Most Wanted U, Sonic & All-Stars Racing Transformed, Scribblenauts Unlimited, Ninja Gaiden 3: Razor's Edge, Guitar Hero Live, the Lego games etc...not to mention many Eshop games.

I agree that several games were gimped on the WiiU, but there are great third party games on it as well. 

Yeah, it's not the best but it's better than the Vita, its main competition. And my mistake, Japanese 3rd party support is decent on 3DS not western. And yes, 3rd party games sold fairly well on Wii because of what Wii accomplished. Of the top 15 best selling games, 7 of them are Nintendo Wii games, made by Nintendo and each is over 20 million. People buy Nintendo consoles mainly for Nintendo games.

And as I like to say, if your game isn't fun, it won't sell. Nintendo knows this. Mario Kart 8 has over a 50% attachment rate on Wii U. It's a great game. So Nintendo's issue isn't that it doesn't make fun games. Its issue isn't even the fact that it makes underpowered hardware. The issue is the pricing of said underpowered hardware. You know you're going to get quality games made by Nintendo. But if you're paying too much for an underpowered console, that's where the issue is. DS was far less powerful than vita, but it was cheaper and thus far more accessible. I think the marketing and price killed the Wii U.

I believe Nintendo will make sure to make the NX a fair price while offering a decent power output and amazing games, and that's a great spot to be in.

The problem is that unless it's powerful enough to play the major third party games it's not going to sell to the mainstream gamer.

Simply put, Nintendo doesn't do enough to appeal to 18-34 year olds and the NX will fliunder and die without them.

I don't think it has better 3rd party support than the Vita.

The 3DS has 943 games currently while the Vita has 1354 games.

That sounds a bit weird. Why would 18-34 year olds choose the NX over the PS4 for the third party support? If they do then that would mean Sony exclusives dont appeal to them either...