Imagine going against a M+K player in an FPS, especially against a CS champion at that.
I doubt they would bother with FPS titles unless they intend to fully support M+K across all their games on their console and leave it up to some players who don't take the new support up and lose their matches.
Mankind, in its arrogance and self-delusion, must believe they are the mirrors to God in both their image and their power. If something shatters that mirror, then it must be totally destroyed.