Wii will. It's lost all it's momentum, but it did most of the leg work earlier in the generation :P
I'd say PS3 will too. It's doing quite well at the moment, I can't see Sony replacing it in 2013 to be honest. 2014 perhaps. Besides that, if the PS2 is any measure to go by (which it should be), PS3 will continue to be supported well into the next generation.
Microsoft I'm unsure about. They're certainly not gonna repeat what they did with the original Xbox and just cut it off, so it could certainly ride a PS2-style wave of selling after the generation is over. Especially if they continue to market it in Europe with Fifa games and casual stuff (although I think Sony will do a better job there). The fact it doesn't sell too well outside America is a bit worrying though, because as people say, I'd find that the most likely region to go all-out for the next generation when it launches.







