Actually, it appears that Windows is actually on track to move down into second place in OS market share behind Android, and into third place next year behind Android and iOS. http://www.asymco.com/2012/06/19/the-evolution-of-the-comput...

I'm actually torn about the Windows platform on this form factor. Solidworks on a Surface - or Core IMPACT (scary!) sounds really cool. The installed base really is awesome. On the other hand, Blackhole, Zeus, TDSS, and everything else will also run on day one (or day zero) - and they'll run on the cheap version or the expensive one.