I think it will do more, if Halo 3 with an established fanbase could do 5.5 Million in the first 2 months on one console with a userbase of about 14 million. Then surely MW2 can do at least double that on 2 consoles with a combined userbase that is now about 4 times that size.
And to put this in perspective COD4: Modern Warfare sold about 6 Million on the 2 consoles combined in its first 2 months, with half the current combined installed base.








