Well you have to ask what would take its place? The alternatives on Star Trek (holotechnology aside) are dull. Some people like to read books; some people like to go to the theatre or cinema; some people like to play instruments; but everyone likes to sit down and be entertained in their own home. Radio was limited by its technology but video entertainment is not.
That is a false generalization. If you believe everyone enjoys television then you are incorrect. I've met many people over the years who rarely, if ever, watch television or have tossed out the television altogether. Yes, there are people who do not own a television, and I'm not talking the Amish or Menonites. How was radio limited? It is/was theater of the mind. Television improved upon the media by being a visual medium, but as people have stated, the Internet is changing bother the medium and the delivery. On-Demand (such as Netflix) is what is/will change television. This past weekend, where I live, was rainy, drizzly, and dreary. Since I only have four television channels available, my selection is limited and the choices are crap (sports and infomercials); however, with On-Demand programming, my choices would be almost limitless.