1000 Mbit will obviously become the new defacto standard.
The only question is how soon.
I think this performance ability will be of "killer app" proportion.
A paradigm changing force.
Of course, it probably will only yield up 100 - 400 or 600 Mbits.
Even so, with *THAT* level of speed, compared to the 10 - 40 or 60 Mbits 100 Mbit NICs get today, eventually I think we'll see it used as the method to have "dumb" human interface terminals (in / out - video, audio, keyboard, mouse, printer, scanner, ....) to the CPU / Hard Drives / Internet resources - back to the long ago centralized mainframe / data center type of concept, but probably done as a clustering type of arrangement and / or multi-processor.
At *THAT* level of performance, it is no longer the speed that is the issue, but rather that there is more or less nothing that can't be done over such a link with very, very little extra time delay. I see it approaching the level of a bit serial backplane, almost a memory bus. (Yes, of course, not matching today's and tomorrow's 133, 266 MHz, .... 64 bit / 128 bit wide backplanes, but more than over powering, say, 33 MHz at 8 or 16 bits.)