On the desktop, Linux is really far away from becoming a “big player”, but on the mobile, it’s become a very different story thanks to Android (remember, Android is based on Linux), just a look at current market shares for Linux and other operative systems:
Created by: MBA Online
Yes, it is true that windows has been lossing the battle in tablets and phones. However, in around four years, The processor are going to have enough size for a 7 inch tablet and enough capacity to support at least Windows XP.
Well, you are right, and I think that’s why Microsoft is considering releasing an ARM Windows 8 version.