lol No again, IMO.
That's the last thing I see happening if Microsoft has any business sense, which they do because they're a multinational corporation.
Mac / PC Minecrafters outnumber the others at least 2:1; they must, just head to the Minecraft or Bukkit forums and start counting. Microsoft buying Mojang for the non-PC version development? That just means that's what they want to focus their own time on - which makes sense since that's the main Minecraft version they've had a leg up on over their competitors. Not only that, but since most of the Mojang staff are going to be staying on for Minecraft's continued development, I suspect it's likely Microsoft just wants to add to their own influence on the XBox versions, not pick and choose how to limit the others.
Minecraft for XBox 360 / 1 is easily the second most popular version, they probably just want to be able to exert more control over its development since it's proved to be such a phenomenon. Ironically, the one thing I would think would result from this sort of thing (the death of Minecraft for PlayStation, perhaps?) has already been forsworn / debunked / what-have-you by Microsoft themselves.
I'm not sure about this, but you also might all be forgetting that since we each have... you know... a
full game
already downloaded (
multiple versions
if you've been playing long enough, like most of us have), not only could you protest Microsoft updates if they started doing things you didn't like, but you could ignore them completely and continue playing anything from 1.8 backwards. If there's shit you want in newer versions, deal with Microsoft's logo being involved.