Here's an estimate from Capcom. I read an interview with a guy from Capcom today in Man!ac, a German video game magazine. I didn't buy the magazine, but I think it was Kenzo Tsujimoto and he was very candid about many questions.
His prediction:
US & Europe:
360 - 45 %
PS3+Wii share the rest
Japan:
Wii - 60 %
PS3 - 40 %
360 - dead
So there you have it. Capcom thinks that the 360 will win this generation, with Wii+PS3 close behind.
I will calculate a global percentage out of this (note: this is my calculation, not Capcom's words). If we assume that the western amrkets represent 80 % and Japan 20 % of unit sales, it would look like this:
360: 36 %
Wii: 34 %
PS3: 30 %
Hardcore gaming is a bubble economy blown up by Microsoft's $7 $6 billion losses.