I predict:
NA: 3.0mil
JP: 1.5mil
Eu: 5.5mil
WW: 10mil
I predict heavy bundling. GT5will be the only GT game for the next 3 years I think. I don't think the PS4 will come out before fall 2013. That gives GT5 enough time to hit 10mil.
I'll come back to this thread in 2013 when GT5 finally reaches these numbers lol