Computers = plural, so you must say "computers are more convenient than TV." My answer to your question is that the market will naturally take care of this sort of problem. There will be no need to eliminate televisions if nobody wants them anymore... if nobody wants them anymore, people will stop buying them and then nobody will make them anymore. But there are some things - sports events and blockbuster films where, I believe, people really like watching them on big screens. Therefore, I suspect that TV will always have its place.

I agree with Andrew, TV still exists because people still pay for it. Once they stop, TV will go away. It used to be difficult to deliver live events like sports and award ceremonies over the internet, but now that most people have high-speed Internet, this will transition over as well. One reason this hasn't happened quicker is because a lot of these live events (like sports or the Oscars), have long-term contracts with TV companies to broadcast these events. Advertising space is more valuable on live TV.