At the moment...[transition to Vista/new OS] there are two types of aspirants....
Those who wish they had the new Vista...but have WB to look like Vista...so they can go 'look at me'....
and...
Those who already have Vista ...who go 'look at me'...
Once many/most have Vista the 'ho-hum' factor steps in and people will be looking elsewhere for faddish/modding/individualistic appeal.
Again Windowblinds [and its skinners] will come up with the goods...to revive that 'jaded' look.
The possibilities within the new OS [Vista] will likely see a much greater interest in skinning [and thus also Windowblinds] than less thereof....