Only six devices? That sounds almost like the old days of SCSI devices...as in pre-USB days, when SCSI was the only way to even "daisy-chain", since serial- and parallel-port devices either required separate physical ports or a physical switching device if you wanted to use multiple devices."The big selling point with Thunderbolt is not only in its speed, but the ability to daisy chain up to six Thunderbolt devices."
And USB can chain up to 127 devices. So I don't see how this is a "big selling point."
Also, thunderbolt never was going to be a tech-changing innovation - USB was and is a well-set technology, and the release of thunderbolt wasn't going to change that, at least anytime soon (mass adoption does take its time).