Dell won't sell *you* a computer without Vista on it... when you are buying 10,000 licenses, the matter is somewhat different.Not to mention that the vast majority of these computers are imaged by the IT staff based on available licenses anyway. It's fairly typical for everything Dell ships on the computer to be immediately wiped off, first thing that's done with the computer. We'll see when 2008 rolls around.
As of right now, you're right. I'm working in the IT department of a company right now, and when we get a machine with Vista on it we usually will wipe it off and put XP on. This is because we haven't fully tested it out and found a way to make things right for the company on it...fix compatability issues and make sure the machines will run smooth. The trouble is that Dell has said they are only selling Vista models when 2008 comes, even though companies most likely wont want that. I'm sure we'll be wiping Vista off in favor of XP for a while...but we can't do that forever.
Another problem with the switch is when you buy a vista computer you will be forced to buy a much more powerful system...with at least 2gb of ran and a speedy dual core processor...If you don't get that then the system will be worse off than it was with XP.
Some of these reasons are why I think I'm gonna switch to a mac, because Vista doesn't really offer that much other than being "prettier" than XP, and while the OS does intrigue me, I would like to try out an mac (having never used one before). I just hope all the hype about macs are right...