(By which I mean everything whiny MS-skeptics have said today (myself included).)
It would be a knockout PR move, suddenly sucking all the wind out of the sails of all knee-jerk-antiMicrosoftism surrounding this acquisition.
Satya, bro, you should really take a page out of Apple's playbook, and announce right now that you are going to.
(That way, whether you really do[1], or you don't[2], most people won't remember the idea anyway...)
[1]: https://swift.org