I think he has a valid point. If you are in any sort of professional environment time is money. In a hypothetical situation having to wait 4 hours vs having to wait 1 hour is a huge difference, and repeated frequently the time savings would easily pay for the added cost.
So really your angry overreaction to his comment made you look like more of a jerk.
In that type of scenario even waiting once should (more than) pay for the price of the unit.
Unfortunately the differences aren't that great, but they certainly are better than the status quo.
People have to remember, Thunderbolt is for the pro's ATM.
There is a certain segment of the market (larger than you may realize) that will pay well over 1$ per gigabyte for high speed, shared storage.
While this isn't storage on that quality level, or even shared for that matter, it's also no-where near 1$/GB either.
For these type of people, operating in a purely professional environment, Thunderbolt is changing the way they do business. For some it is/will be slower than others, but it is happening nonetheless.
Just recently I have seen macbook airs doing high channel count audio production using TB interfaces, I have seen QuadCore iMacs being used in a shared editing environment with a TB fiberchannel adapter, and even a mini injesting SDI video and doing quick edits while working off an SSD scratchdisk.
Thunderbolt is one of the biggest thing to happen for professional media types in the past decade. It finally begins to deliver, in a meaningful way, on the promise of doing serious work away from their suites; additionally it opens up a whole new world of lower-cost node options for the jobs that don't require a 10'000$ tower.
The prices are fair at the moment for what is still a very young interconnect, and it delivers very good value with relatively few teething problems. Will the prices come down in the future? Absolutely. Will it ever be a day-to-day consumer interconnect? ehh....... who knows.
I don't think any of us are ever expecting TB to replace USB though. Different horses for different courses and all that.
Karl P