The reason I say that is due to the fact that video cards are the only common device in a consumer PC that could push the needs for a faster bus.

True. The only other thing I can think of are harddisk controllers, more specifically SCSI controllers. The last Adaptec SCSI controllers (29160 and up) all have 64 bit PCI interfaces (though they also work in "normal" PCI slots).
IDE won't make that much of a difference anymore, since the limits of that interface have pretty much been reached. But maybe serial ATA might ? I can tell you, that's one piece of technology I'm looking forward to. I only hope that they develop it properly so it works as promised from the very beginning. Otherwise we might have a second USB débâcle on our hands.