Which is why Thunderbolt with its daisy chaining, dedicated controller per devices and ability to run multiple mass storage devices with little degradation in performance to anything in the chain, is much more desirable to USB for connecting boot and primary storage devices.
By the time all this wishing-for and shoulda-woulda-coulda's have been thoroughly belly-ached with no constructive outcome, its becomes pretty clear just how affordable and effective Thunderbolt is when employed for its intended purpose.
I am talking what exists now.
Please point me to all of these thunderbolt drive enclosures I can put my SSD in. Not Raid enclosures. Not enclosures that come with a drive. A simple enclosure. Oh right, they do not exist yet! The current drives with TB connectors do not meet my needs either. They are usually in the 1TB-or-less range.
The enclosure at http://eshop.macsales.com/item/Other World Computing/MOTGTBH5T1.0/ is almost right if it were sold without the drive. The big problem is that it only has one TB port so I can not daisy chain something after it.