Can Halo 3 break 10 million in America, lifetime?

[Kantor]

No. It'll break 10 million worldwide perhaps by the end of this year, but its sales won't stay relevant for long enough to hit 10 million in America.

In simple maths, it's a 3,096,327 gap. At 32,599 sales per week, that would take 95 weeks. Of course, in reality, it's not going to sell at 33k per week for that long. It, like every other game, will drop off eventually. Other, better first person shooters will come (one is already on 360, and PS3 for that matter, and another releases this holiday for both), and people will lose interest.