[MetaCosm]

Thunderbolt is way too expensive for most hardware (and tightly controlled, which bothers some manufactorers), and USB3 is damn near free. Thunderbolt is expensive for the manufactorer and expensive for the user (read: complex cable requirements). With USB3.1 "doubling" the speed of USB3.0 in a backwards compatible way -- I suspect it will continue to dominate.

[ycui1986]

There is one thing, USB3 cannot solve, the latency(typical latency of USB is around 1 ms, compared to PCI-e sub-us). Graphics cards will never work on USB3 port. Well, external graphics card is for consumer market. For industrial, high speed data acquisition system has sub-us latency over PCI-e bus, which is included in thunderbolt. That is one of real application of thunder bolt. But I have not seen any such device utilizing thunderbolt.

[MetaCosm]

This isn't actually true -- the latency of Thunderbolt is 1.5 microseconds, which means if you are building something (like a video card) with internal latency expectations, they will all fail.

If it had internal style latency, there would be GOBS of devices pushing to jump on it, but it simply doesn't. You can't even respond correctly to interupts... compared to internal PCI -- it is painfully slow.