I think you are overreacting about it. Microsoft is a good company. They won't buy a popular kids game and monetize it.
If Disney or EA bought it, on the other hand.................
I love how they talk about Microsoft buying Minecraft and then show the PS3 version of the game.
It would be immensely profitable for them to obviously keep the PS3 one. Sony already owns the contract or something for the PS3 game version.