The lack of change does not have much to do with Vista. The main reason is that businesses are slow to make changes. Once they are comfortable they will not want to touch anything, specially if that means coming out of pocket. Now that being said, yes, Vista sucks.
I wish I could vote you down because this just isn't true, Vista does not suck. This statement is so very tired that I sometimes wonder why I still hear it. What is it that makes Vista suck to you? I've used Vista for 6+ months now for work and I can't name anything particularly sucky about it. Conversely, just the other day I discovered DEP which actually seems like a feature that they should have touted more in the marketing.
Why is there still mindless hatred of Vista? I'm actually kind of excited about Windows 7 which I can't say I've ever been able to claim about any release of Windows.
Sorry if I offended you in any ways. I used Vista for one year before my laptop died. Although the graphics were nice, I found the entire experience less rewarding then using XP.