I think that gets to a major risk of continued windows focus by Microsoft, in 5 years it's possible that Windows market share will be below 50% with most new so

I think that gets to a major risk of continued windows focus by Microsoft, in 5 years it's possible that Windows market share will be below 50% with most new software written for nix systems. History has not looked kindly on OS's in such an environment, and further market declines may be inevitable as windows begins to look like a legacy platform or a use case specific platform (Games). I'd have to imagine that Microsoft has been thinking of what their Desktop OS play would be at that point, allowing windows to simply die a slow and profitable death would threaten other business lines such as Gaming. Non-Apple hardware vendors will be looking for OSX like systems to compete with a possibly dominant OSX platform.