The bandwidth increase is really promising. The only problem with X-Rays is that exposure to them is fatal.<p>http://cseweb.ucsd.edu/~gmporter/papers/porter-xray-tinytocs13.pdf
It seems like the propagation issue is significant. What about radiation effects in semiconductors they will cause? What about using other modulation like QAM or OFDM at 60 GHz? What about advances in fiber?