Seriously, the only game that has like an outside shot (and I mean slim) of outselling either WSR, Wii Fit is the total combined multiplatform sales from COD Modern Warfare 2.
If that game can somehow pull in Halo like sales on the 360 in Nov/Dec and also become the best selling games on the PS3 at the same time (both scenario is very possible, BTW), then it might have an outside chance.
Single platform no, but a combined sales from the 360/PS3 will give it like a 50%, and if you add PC to the mixed, then I could see about a 75%.

















