Even though it doesn't work with existing networking products, the fact that the Cat-6 runs are there in my house would come in handy.

Also, what other technologies like this have already failed? Maybe we can compare and see if any of the differences are, in fact, worthwhile.

While I agree we're stuck with HDMI for now, it'll reach its limitations sooner or later, and if something like HDBaseT is around to step in, I'm all for it.