Not in the long term. I see it selling at least 1m by year's end on XBO, if not more. Then there's the inevitable PC port, which will sell a lot. And if/when it hits PS4, it will still great on that too.
The move to make it a timed exclusive on XBO won't hurt its LT sales, I feel. MS is banking on it being a system seller for the holiday period after Halo 5, and SE wouldn't have done the deal if they didn't think they would sell enough copies of the game.








