They can't. Have you forgotten Tomb raider already?
Besides, Sony only did that at the beggining of the PS one era. Dunno if you can call it a Sony practice alone.
Anyways, sure, they can maybe do it at the beggining of a new gen, but it's impossible now. I don't think theres enough money MS can offer to make up for PS4 sales of a game. Only small studios would agree to that at this point.







