More likely they'd put him in charge of a new studio that's working on the rumored new Perfect Dark. MS has spoken in the past of rebooting Perfect Dark in the style of the 2013 Tomb Raider reboot, in other words 3rd person action-adventure-stealth with a heavy cinematic focus, and this guy was head of Crystal Dynamics while the Tomb Raider reboot was in development, he's perfect for heading up the new Perfect Dark.
That actually sounds awesome. I don't have an XBox, but I remember playing the original Perfect Dark on my N64, and that sort of re-envisioning would be amazing for that story.
Here's the quote from MS Studios Creative Director Ken Lobb a few years ago:
"Today, no one is working on a new Perfect Dark," he said, "it's in the discussion a lot. In a world where you have Halo and you have Gears, having another Perfect Dark Zero-style game maybe makes a little bit less sense than something that's a little more story-driven around Joanna, whether that's third-person with stealth, et cetera, et cetera ... we like the IP. Maybe we'll see another Joanna Dark game with Joanna by 2020. That would be an interesting year to bring her back."
And here's an article about the rumor which suggests the new Perfect Dark is in development now: http://www.nintendolife.com/news/2018/01/rumour_a_new_perfect_dark_game_is_in_development_but_rare_isnt_involved