“I don’t I think that Microsoft has a contract to make sure that they get that sequel, But I think Epic regrets signing that contract,” the wedbush Morgan analyst said. “You’re up to 11 million PS3 in the US and probably similar number in Europe, you got a 20 million addressable market with a game like Gears of War, I mean that thing would easily sell 3 or 4 million on the PS3; that’s a lot of profit.”
PS3 exclusives hardly does that. Also, Gears is heavily marketed by Microsoft, that's why it sold so well on the x360.
Without the ammount of effort and money that Microsoft is putting, I doubt that Gears would sell 2m on the PS3 or x360.