Perhaps not the 90%... But they will still be in good business.
Future computer market will also diverce so that we will see Linux, Mac and Win. in an ever expanding area. By now we already see embedded, cellphones and multimedia as new operating system areas (yes, Linux has been embedded a long time but have Windows been so?).
I agree that Linux is developed faster and i am thrilled to see it.
Not to mention what Linux is on servers.
A couple of years ago Balmer had he´s rants against open source and compared it to cancer; it affects everything it touches.
I´m sure he had some plans to use some open source in Vista and desided to read the license
But OSS developers and distributors are also limited by their own license.
Linux would have a lot better market penetration if distros had all codecs, Flash plugin, ati/nvidea and everything you´d like to install stright from the downloadable distro.