Probably get another 3 months out of it before they kill online authentication and you won't be able to play multiplayer any more
I honestly have no faith in Microsoft doing anything with Minecraft on the PC. You just need to look at how everyone talks about minecraft it is allllll about the 360. People seem to completely forget that Minecraft became huge on the PC first. I would be bloody surprised if Microsoft even acknowledge that Minecraft is on the PC on Monday.
Perhaps I am wrong, it would be nice if someone could give us an example of a PC franchise Microsoft got involved with and didn't completely and utterly destroy it and neglect the PC. Just one example, just one insy winsy lil example of where Microsoft didn't completely and utterly fuck the PC.