Well, I can't see Windows really dying, but I wouldn't mind if it matured.
I also use Windows for most of my work. I need to use a lot of software which is written for Winows only, so it definitely has it's uses for me, but I can't say I really like it.
There are too many annoyances, and the design methodology of MS (not talking about their business methodology) goes against the grain. I feel Windows is something I can force to perform the way I need it too.
It's been a while since I've written any software for Windows, but I am told that it has convenient API's. I think that certainly would be appealing.
Dare I say it, I also like what the Windows user base has to offer. When I used Mac classic, it was often not easy to get info on how to force the OS to perform in a non standard way. I'm guessing that's not such an issue in OSX.
I think it would be a real plus if MS had a powerful motivation to improve Vista. I don't look forward to learning how to customise another Windows OS. It's usually quite a hassle to tame each of their new monsters.
I need to buy a new PC soon, but I'll probably install a second hand XP Pro.
oops, rambling again...