Are many computers shipping with USB3 though? I honestly don't know, but I was under the impression that Intel had delayed USB3 implementation on it's products. So anything running an Intel motherboard would seem unlikely to have USB3 - unless it was added by the OEM. In other words, did the peripheral manufacturers jump the gun on USB3?
I think the biggest difference between the USB/Firewire battle and the USB3/Thunderbolt battle is the Intel factor. What level that impact is remains to be seen, but I think it's safe to assume that just about any Intel motherboards from here out will have Thunderbolt on them. That's a much better playing field than Firewire had.
Do you know where children get all of their energy? - They suck it right out of their parents!