My company just finished deploying Windows 7 with a handful of users still hanging on to Windows XP due to legacy apps. A lot of companies are beholden to their line of business application provider and can't even install a service pack without the vendor's blessing.

Businesses aren't like consumers. They don't base their purchases on one vendor's product release cycle. This isn't anything against Windows 8, it's just the reality of running a business. I'm pretty sure that even Microsoft won't upgrade all of it's PC's to Windows 8.