Thats a false assumption in that it assumes that without copyright not only will there be no more media, all currently existing media (which is already far, far more than you could ever experience, even once, in an entire life) will disappear.

Hint, it won't. And at this point we might want to ask ourself if it isn't worth taking the hit that will result from removing copyright on already existing goods, since there is a limit to how much media we can consume, and we already have plenty.