Honestly, microsoft would likely be better off financially shedding its OS business, its never been a revenue generator, and with the increasing complexity required for staying current it going to get many times more exspensive for them to keep devloping windows. I think MS will likely move to toolkits, frameworks, developers tools and applications like office, as a income stream. As these are largely there biggest sources of revenue as it is now.
I just wish they'd pull the bandaid off and get it over with.
The whole reason Windows even exists, is becuase they needed a OS to run their applications on, for use with open hardware IBM PC clones. Thats pretty much it.