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Thunderbolt is very expensive to implement still. SSD's are expensive still. If you can afford to have these luxury items generally you have a computer that has plenty of storage so external is a moot point. Also when the embargo on TB is lifted Intel will make it more public and Dell will start selling and the price will most likely go down.
 
I am hopeful that in 2 more years ssd & thunderbolt drives will be much more common. Apple was a very early adopter "first", of thunderbolt so hopefully when more computer companies jump on the intel thunderbolt bandwagon there will finally be the critical mass needed by the drive manufacturers.

At this point I would be very happy with a usb3/esata to thunderbolt converter, at least until straight thunderbolt device prices become more common.
 
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