none of the true talent will stick around for MS anyways.
I think you will find that unlikely, given the state of the games industry job situation. Why go out on your own when you can have a secure job with great pay?
Sure if people have the talent to actually start a new company like the Goldeneye people did they might leave, but you need a hell of a lot of money for that nowadays.
Staffing at Bungie didn't change much after MS bought it...