Secondly, how many people are really gagging for USB3 on their Mac?
Er, most of them??!?!
I bought a cheap Samsung 1TB USB3 drive last year for about £80 (including the cable!) and it flies along backing up Windows at about 150MB/s.
Who would *not* want that?
Exactly. There's not a cheap, fast data transfer method available to us. FW800 is OK, but not as fast (or ubiquitous) as USB 3.0, and most other computers don't have it, requiring a FW800 + USB enclosure if you want to use it with other computers. Thunderbolt costs too much for housings and cables ($50 TB vs $2 USB 3.0 for cables). Plus, USB 3.0 is everywhere today - on external HDDs, flash drives, media card readers, etc. For the average user who actually cares about speed, it's well worth it considering it's now available (i.e. I wouldn't buy a Windows laptop over a MBP just for USB 3.0)