“Vista's success was not always a foregone conclusion. Early Vista buyers complained about the lack of compatibility with existing devices and software programs.
Microsoft also buckled to PC manufacturer demands that the company delay the scheduled transition to Vista and extend sales of its previous Windows operating system, Windows XP, for another five months because some customers preferred XP.”
More homes and businesses running Vista should motivate hardware vendors to get their driver teams working harder on Vista support. It looks like naysayers who predicted that Vista wouldn't hit its stride before SP-1 might have been quite conservative.
Now if only more consumers would start migrating over to 64-bit...