Oh no, no no no no.
Yes, I can see why MS wants this. Obsidian accumulated a lot of former Black Isle staff (like Beamdog and InXile) and they formed a working studio with that. So from the view of MS it really is a purchase that would do very well.
From my view it is bad, as the Obsidian games would move to platforms I don't own. That would be incredibly bad, as Obsidian is not just one dev for me, it is one of my most liked.