It's not just MW2, I'd imagine Assassin's Creed 2 is the other game causing developers to flee.
All these publishers will be monitoring the response of these games from E3 and in general, and many have commented on previous holiday seasons where consumers are going towards buying a few games from the big established franchises. I think it's very high risk for any games to launch against these two behemoths and there are going to be alot of flops if they can't rake in their (R)October sales.
It is quite insane though at the moment, this back log could go quite far too. You're normally looking at one big hitter per month in the first half of the year, at the moment we could be looking at one per fortnight :/.







