I think it will be-
PS4- 70 Million
Xbox One- 60 Million
Wii U- 40 Million
This will be, if I'm not mistaken, a Gamecube Era for Nintendo. But really, who cares? I loved GameCube and with the Wii U there is even more to do, more to be seen, and more to love. Sony has this neat system with Kingdom Hearts III so I'll eventually get it.