I think you have it backwards. It's the "mature" games that are made for children. Adult gamers are secure enough to look at games objectively and appreciate them for their mass appeal.
The only people it's going to really appeal to is the strange 30 something man children, that are desperately trying to chase some feeling from their childhood by enveloping themselves in things made for children, all the while looking down their noses at people because the don't understand the "magic". And I imagine these people have a wii u already.