There is a very interesting post on Techdirt asking this question and giving some interesting pointers to future posibilities;

For years, in discussing how copyrights really aren't necessary, it's always only a matter of time until someone brings up the infamous $200 million question -- first asked to me by someone at NBC Universal years ago: "But how will Universal make $200 million movies without copyright?" As we've explained, that's the wrong question....The real question is how will movies make money -- and that's easy enough to answer. As plenty of folks have been pointing out for years, the movie business isn't selling movies, but selling seats to an experience. Put on a good moviegoing experience and the money will still come in.