I really would not doubt that Vista will help make 64-bit much more widespread, though. I mean, imagine. Some PC vendor is going to be all like... "Hm, well, let's sell 64-bit cpu pc's with vista 64-bit, I mean... Hell, it's the way of the future."
Then some poor 'ole sap that does know close to anything about computers will get it and have to deal with all the 64-bit stuff. But it won't just be ONE poor 'ole sap, it'll be a whole bunch. And they'll get to complaining and eventually, the companies with products requiring drivers will start to support it more and more. While this is happening, Microsoft will be milking out updates left and right to make sure that the people don't come complaining to them and sooner or later, 64-bit will be fully adapted and wide-spread.
Hence, one reason I've made my decision.
And yes, kids... I am going to purchase Vista. I'm tired of all this Genuine Advantage work-around stuff... Although it's worked quite nicely for the time being.