In the first place, MP3 is not really a very good music format. The new generation of DVD's will provide better quality sound and there will always be a market for disks. In the second place, even though it has long been possible to record music off the radio and television programs off the TV, the markets for CD's and video tapes continues to grow. A lot of people just want to get the disk or tape in their hands. Anyone can get on the internet and distribute and promote his or her own work.
Video is next.
The fact that we cannot, at the present time, watch television programs when we want to, rather than when they are scheduled is, when you think about it, absurd. Someone should have it on file somewhere. They would publish the specs for creating the compression algohythms necessary, and make it freely available to all. However, even after twenty-five years of development, most people still don't use it regularly to tape programs they would otherwise miss. To watch pre-recorded tapes rented, at outlandish prices, from a video store.