I think the problem is that Google has lots of good ideas and big goals, but they always end up releasing their products half-baked--always promising more features as time moves on. Most users aren't patient enough to deal with a buggy product, waiting on the promise of a better product at some unknown point in the future.

""maybe everyone's cleverly hacked their Ultimate Aero Glass Vista to fit on their old PCs."" Or Microsoft may be lying about how many copies of Vista have been sold.