There are always going to be people resistant to change, and of course there are always people out there who like messing with old stuff.
I love old cars, some people love old computers and operating systems.
While I believe the world would be a better place if we all drove Triumph TR6's and Lotus Elans, it's only a dream. The reality is I've got all of my friends driving Honda's and Toyota's because they are safer, cheaper and more efficient.
That's not a valid comparison IMHO. Old cars are slower, pollute more, less safe. With XP I can do everything I want to just as well as with Windows 7, without extra DRM, warnings and authorisations popping up, it's perhaps faster than Windows 7 or at least around the same speed, and while XP may be in theory less safe i've never had a problem caused by a security problem with Windows. Because XP's smaller and older it's faster on some hardware.
Let's turn it around, given XP is smaller, faster, and works perfectly why would any sane person pay money to have a slower computer than will let you do exactly the same things? It's an OS, it's not like upgrading to the next version of photoshop, it's plumbing.

You can turn off the popups and such (which run much less frequently than in Vista), yet it still tries to enforce safety (so certain programs should be run in admin mode). Windows 7 is an OS that looks like vista, sprints (when using more than 2 cores, it really does much more than just "run") like multiple copies of XP, and is more secure than both of them. And if you know how to install and clean up, it's about 4gb vs 3gb for XP, yet in the prime of XP, a 250gb drive was huge, and W7 has been out for a few months and we already regularly see 1tb-2tb drives. And if you turn off aero and do a few other tricks, you can get it to run on 
as I do not use XP x64 maybe thats why I find it so stable I could go on but why bother think you just like to disagree for the sake of disagreeing.

