I think the Wii U will have more game genres developed for it tbh. Think of it this way:
When MadWorld first debuted on the Wii, people didn't tend to like it because it "ruined" the image of a family console. Now, look at the Wii U: There's Black Ops, ZombiU, iirc an Assassin's Creed title...
I think the future of the Wii U holds more game genres to cater to everyone's needs.