The problem with the Wii U wasn't the concept. It was the execution. The idea of a portable handheld console is a sound one, it's just not a universal need. Making your console dependent on a niche feature and only having like 2 exclusive launch titles and bunch of third party ports is not going to compel people to buy a whole new console, especially when everyone and their grandma already owns your previous console that had hundreds of games available on it. I bought one with my brother mostly so I could play Breath of the Wild when it was impossible to buy a market price Switch. It's perfectly fine as a console and I used the portable mode on occasion. It just doesn't have a lot of other reasons to exist.