I can't follow this argument. The major external devices that require high bandwidth are storage and display. Based on calculations noted above, TB is not going to be suitable for driving multiple large monitors. As far as storage goes, I have a single 6Gb SAS connection between my MP and an expander, and that is no way near saturated with a half dozen SAS drives. Sure a bunch of late gen raided SSD's may do marginally better on TB, but when you factor in the signaling overhead, esp with daisy chained devices, the magnitude of the improvement is unknown at this point.
Yes, I agree with you. And in it's infancancy it sure is limited with one port.
But once we can have several ports, it's really going to rip things up at a fraction of the cost. I should have stipulated this in my post.