Pretty good thread
I'd also like to point out that the concept of the WiiU was also horrible. Having to look at two screens at a time to play a game is a broken concept that proved its failure, so the WiiU was hindered right from the start with its broken desgin.
Another thing is the rise of mobile. The types of games that Nintendo were pushing with the WiiU, the asymmetrical games they pushed like warioware or Nintendo land, are similar games that found success on the DS like brain age, they were also pushed to the same demographic that a lot of Wii games were sold to. These type of games were now easily apps on mobile, free apps. And no matter what Nintendo would do, they lost that demographic. Even on switch that demographic is gone, they tried with 1-2 switch, and they tried with labo, the latter now bombed completely (even though it's technically a bit different). Without a doubt the rise of mobile clearly hurt the WiiU
Another thing being it's crappy hardware specs. It was basically the same level as a PS360 machine, and while people can keep changing "graphics don't matter" chant, the fact is people like their purchases to have quality hardware, the WiiU was certainly a disappointment on that front. Specially at its price point. While the switch is not much stronger, as a handheld and mobile device it's a huge upgrade from the 3ds and even a big upgrade from the vita.
