my PRediction...
Wii ~50 million
360 25 million
ps3 20 million
as to Next Generation- you know the one that comes out in ~3 years or so...
the "Wii2" is going to offer imo the most significant upgrade graphically and processor power wise vs the other two- while the other two- if they come out with new consoles- will receive minor graphic upgrades, a decent processor upgrade and...as to controller imo they will start copying the motion control scheme more.