That's nice in theory but every post house I've worked at still needs plenty of thunderbolt and usb drives. The footage isn't shot at the post house, it has to be transported and copied over to the SAN, and everything is on a tight deadline so it needs to be done yesterday. Or rather than using the in house colorist (or fx artist) the client decides to go with someone else, so that often means copying footage for that delivery. And the client wants two copies of it, one for archive and one because the creative director wants to dick around with it. Or the post house is over-booked and the only edit station is an imac not connected to the SAN, so copy it over to a drive so someone can start working. Plus with everything shot on digital it's not unheard of to get 20 or more hours of footage for a campaign. On a RED or ARRI, that takes up a lot of space.

Half my work now is out of my home now, I don't need a SAN, instead clients ship me a thunderbolt raid (typically a G-Raid) that I ship back once the project is finished. And I know more and more editors and motion graphic artists who are doing the same, less work in edit suites, more work at home. Fast, portable drives makes that possible (and efficient high quality codecs like ProRes and h264).

I've been doing this for 20 years, we'll still need fast, portable storage for many years to come and right now, for video editing, Thunderbolt is the best choice.