I think that's an interesting question. How many bands are in it just for the money? I can't think that many are, as very few bands become huge commercial successes. There has to be a love of the art for them to struggle through the "starving artist" years. But, if we stopped paying for music, musicians would, definitely, have a difficult time making a living. Perhaps we would see fewer full time artists. However, I think making music is an intrinsic characteristic of the human race. So even if music became free, it would still be present in our world.