Well Wii Sports Resort and NSMBWii are both going to pass all those non-Nintendo games, which will push Vice City out. Wii Fit Plus will probbaly do the same.
There is not much else that we know of at the moment that could beat those games, not to say there will not be any in the furture though. I suspect Gran Turismo 5 will be out of the top 25 by the end of the generation too, with a slight possiblity of The Sims as well, but not San Andreas.
So for the next 3 years at least I believe San Andreas will still "hold the fort" in the top 25... probably in about 19th/20th.... while The Sims will still be there in 23rd/24th