First of all, this only polled IT Administrators. I know of departments where I work at [and even at my old jobs] where IT admins tried to talk users out of upgrading to XP, Vista [and I guess now, Win 7]. The problem is, the user is still the customer, and as much as you want to talk someone out of something, if they're the ones with the $$, you have to do the task.
I used to try to talk people out of switching to XP because 2K was much more stable and for simple things like word processing, internet browsing, etc. it was more than sufficient. But everyone wanted XP, so I'd help them upgrade [I'm talking both about work and for friends/family]. I recently installed a dual-boot Ubuntu/Win XP setup for my dad, and still he uses XP more. He wanted to be able to play around in the apps he used before, and if any of these companies are upgrading computers, you can bet that people will want the latest and greatest [assuming Win 7 is able to work the eye-candy into things].
TFA does cite economy as an issue, but most companies are probably thinking "Could it save me more money now to do a full-upgrade and not deal with the downtime later as I have to do it later?" and that might be a mitigating factor.