Maybe they will do that. But if they release a new console with a new kind of controller + compatible with all other wireless controllers that they have released the previous gen, then after 3-4 gens we'll end up with 4 diffrent controllers + many perhiprels (or whaterver it's spelled) like balance board etc.
It doesn't sound easy to play with all that together and it takes up a lot of space, aspecially if their controller become bigger and bigger.
Imagine playing with Balance board, Vitality Sensor, Wii U tablet and nunchuck together :O That's almost impossible!







