The wiring is localized and free since it is lithographed and short run. No long wires for transmission line effects and high power driving. Optical is option but I think harder socially and technically in the now-term.

60Ghz CMOS is already a thing http://www.seas.ucla.edu/brweb/papers/Journals/RJan06.pdf

http://www.home.agilent.com/upload/cmc_upload/All/Webinar_60...

Also http://en.wikipedia.org/wiki/Ultra-wideband

Watch out for the "Hazards of Prophecy"