Enterprise customers held with contempt are evaluating third party vendors they never would have considered before. If you force people to use a new interface regardless, than it's an opportunity for your customers to pick what that interface is going to be. Sales of Mac's to the Enterprise have hit record highs, Linux is breaking through where it never did before. People are even toying with Chromebooks.
This seems a tad hysterical. Enterprise users will continue to use W7 for a while yet. It still works, is still supported and is less of a headache to maintain for the tech guys than upgrading everything to work with W8. Businesses aren't clamouring to upgrade all their machinery just because MS has a newer OS.