One TV in the living room. We have another one tucked away in a closet somewhere - we thought the TV was dead because we'd swapped out everything else and still had problems and eventually replaced the TV, only to find the problem was that the power socket wasn't wired properly. So having replaced the socket and all the wiring back to the breaker panel we have a working spare TV.
I don't care for the idea of having a TV in every room or having the TV on all the time. Some people apparently like it, I just find the relentless noise annoying.