I'm one of those 'if it aint broke, why fix it' people - especially if I have something that works well for me.
I had XP Pro for a long time, and was worried when a new computer spec had W7 Pro. The company building it assured me that I'd find it better, and true enough, though virtually dragged kicking against it, I loved it within a very short time.
Had it two years now, and also had it installed on a new notebook recently.
When I do see something new that I think is better than what we already have, then I will embrace the new.
I have seen W8 but have no current wish to exchange my W7 for it.