My 2 cents...
The PC is supposedly dying, that is why both Microsoft and Intel stocks have been flat. MS wants to better compete in the mobile market and has made a few attempts. Windows 8 wasn't a great success and they had a major restructure at MS to deal with the new market.
They have about 40 billion dollars just sitting in the bank to deal with a changing market, with that kind of cash you can have many false starts and launch heavy opposition. Microsoft dominates markets and destroys competition, so I don't think MS or Windows will be going anywhere soon...
I do wish that Commodore was in this position and that the Amiga was the Market leader, but that's life.
