I know what your thinking about. Its like a STB that sends out a broadcast (UHF/IR), and your given 3 or 4 remotes, and your remote is like a portable phone, it doesn't have to point at anything.
But the wires would still have to come from the main STB. This technology is already seen in IPTV, with 1 main STB that powers 3 TVs, with 3 remotes, and cable going from the STB to the TVs.
And in Dual tuners. Some dual tuner STBs for satellite and digital cable have the option on letting you have 2 TVs hooked up. And they have 2 remotes. Dual tuners use 2 frequencies though IR and UHF and the main TV on the dual tuner you still have to point too.
But I agree, I would prefer an industrial piece of hardware that could allow me to not have a STB on every TV.