If everything goes in Microsoft's favor then it will soon own the Call of Duty franchise, and it will be able to cement itself as the biggest name in the FPS genre. While Call of Duty will likely remain on PlayStation for the foreseeable future, Xbox will have a significant edge in the FPS market going forward. If Sony wants to compete in that space, then it may want to tap the newly acquired Bungie to kickstart a brand-new first-party FPS franchise.