Until H.265/HEVC patens gets sorted out and then implemented into software encoding engines, UHD won't be going anywhere. Michael Grotticelli writing for Creative Planet Network:
While it had been hoped that a patent pool license for the High Efficiency Video Coding (HEVC, aka, H.265) compression scheme would be available from licensing body MPEG LA by now, encoder/decoder vendors that required this patented technology to build their products are still waiting.
4K is currently only for post-production uses - tracking, stabilizing, pan/scan, and mastering. Until there's a way to deliver to the end user efficiently, not destroying data caps in the process, UHD won't see the light of the TV screen.