It seems understandable. I mean, GTA 4 should be as big as SSBB in attachment rate, if not bigger. Now, the attachment rate for 1st week WW SSBB will be between 16 and 20 %.
Total X360 + Ps3 is currently at roughly 28.3M, and perhaps 29.5 within then. To make it easy, I say 30M
So 20% would be exactly 6M. This seems very possible to me...
IF GTA IV is as big as SSBB, it will sell 5-6M first week.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS







