Like I said in another thread my money is on a Wii Slim this year. New Wii fall 2012 at the earliest possibly fall 2013. There is absolutely no reason for Nintendo to rush the launch of its new console but instead they should wait until their competitors move first. The Nintendo games are beating sells records after sells records on this platform and at the end of the day that's what really matters to Nintendo. It doesn't really matters if the Wii is not destroying the competition anymore: they have a huge installed base and they would be stupid to stop to take advantage of it anytime soon.
Here are the big guns they could use to keep the Wii alive until then though: Zelda of course, Wii Slim, DQX, Pokemon, Wii Relax, Yoshi's Island, price cut to 99$... With that (and of course a steady amont of less selling games including Pikmin, DKC2, New Miyamoto IP, localization of japanese games for the west, MH3G for Japan, Wii Music Plus...) I don't see why the Wii couldn't last easily two more years.
