Or maybe Microsoft will do what they said and keep COD on PlayStation. If Sony decides to make Bungie's games exclusive to PS after saying they were keeping them multiplatform then Sony would be raked over the coals. And they should be.
First I am saying that Microsoft should go back on their words. I am just giving scenarios where Microsoft would differentiate between different platforms.
As for coals and all, I am sure we will also have enough supply of justifiers and how we took the words out of context (multiplatform=PC and playstation)