No only dont you need more power, you certainly dont want Vista force fed to you...

"Maybe it's just fast enough?"
Well between that and the worldwide recession I'd say the worldwide recession has probably much more to do with it. But, certainly, there are some who think like you do.

Maybe the hardware is just fast enough for most people now that upgrades just aren't worth the money? You can spend $500 and get a extremely decent machine that would put virtually anything three years ago in the dust. Monitors are huge and inexpensive; RAM is so cheap and plentiful that 2GB is standard; even the cheap sub-$100 processors have four cores. Now, more than ever you'll have more than you ever need, and it's not like this is just recent. So why bother upgrading from that?