Well, most families have two TVs in the house, but usually one is in the living room, and the other is in the parent's room, unless they have two living rooms. So the Wii U tablet is still useful. Also, if you only have two TVs...you can still let one child watch a movie and the other play a game. There are uses.
Also, I am now a laptop person...I don't need that much power for my computer....and I like that laptops are less cluttered, and more self contained. I do take my laptop out sometimes, but not always. I just think in this day and age...I only need one computer. So I should make it a laptop so that if I need portability I have it. Options are good.
The same with the WiiU...even if you don't need the screen in your house...options are good.