We already have a hundred cable formats out that support fast data transfer, certainly there are plenty that would not cost £39 to buy!
The problem is no one wants to be budge from the crappy USB spec and come up with something really good using better cabling. eSATA should have been awesome but isn't reliable IME.
Mate, look at lightpeak some. It is flipping awesome, intel made it so it going to be standard and why USB3 aint kicking off.
It is not Just a cable format, this is the important thing. It is not just ports either. The chips in the devices dedicated to the data transfer is important and the transfer rate over copper is flipping dam cool and once they sort the power side of things they will swith to fibre and be even faster AND backwards comptable with their current implementation.
To that as I mentioned in other post the way they have designed it allows you to use any form of connector you like and also use those cables for other standards.
So for apple they use their display port which still works as a display port as well as Thunderbolt and it is likely most PC manufactures will use USB connectors.
The cable is expensive because it has chips in the cable also either end but considering you can have duel monitor, network and audio and have data transfer two ways as well - pretty tidy desk.