Xbox has to force people? Do you know how anti consumer that sounds? Steam doesnt force people to do anything. They just have a great service that brings people in. And they are a threat to Xbox and Playstation. And GOG is approaching as well because of their service.
Xbox has to do something different.
If you truly want the hardware platform to be around long-term, Xbox has to force people to buy games and buy the platform.
This means exclusives; this is why PlayStation is apparently shifting away from their single-player PC game launches.
I think multi-platform games only work if they're multiplayer games, which Sony/PlayStation seem to agree with.