Wii Fit U
If those are all the Wii U exclusives you could list then I think that says it all.
Compare those 3, versus the dozens the Switch has. It makes no sense to get a Wii U over a Switch. It makes sense to get one if you already have a Switch, and you have money to burn, or you're a collector.
If you want to play Wii and GameCube games and VC the Wii does that perfectly and is like 10% of the price. You can almost get a Switch and a Wii for the same price as a Wii U. Which will play everything you listed except the 3 exclusives, and much more.
DS games should work quite well on Switchroot Android. Drastic is not a demanding emulator. Even many GC games run quite well on the Switch, so DS should be no problem at all.
Granted that does require modding it. Modding a Switch gives you so much more than modding a Wii U does though, so it's worth the hassle.
Sounds like you're just hating on the Switch for no reason since you're completely ignoring the huge library of games (including exclusives) it has, plus, it's portable, comes with 2 controllers so you can play multiplayer right out of the box, it has the superior Mario Kart, it has the superior Smash, emulators run much better on it, and there are still games being released for it.