Well it takes atleast 3 years for an os especially windows to fully takeover.
Even xp was used extensively after 2003. And now everyone use it.
So vista will also take similar amount of time.
Especially the gadgets. I always envied apple's widgets. Vista gives you the familiarity of Windows (i hate working on a mac) with the slickness of Mac OS X. That's all i ever wanted in a PC. Everything works out of the box
i won't upgrade to vista for a long time, doesn't worth the efforts
why should i buy more ram/upgrade my GPU/CPU for vista which eats your ram's like hell because of all the blink blink useless graphics