At the end of the day the issue of mashups implies the responsibility of those who make them possible. There is somebody at the end of the line in the YouTube case who makes money out of the mashups and the use of the works being made.
The way to collect that money is through that system. That's why we're saying that for the time being, if you cannot find a way to make ISPs responsible and the companies that make money out of the work of others pay for it, there are systems that exist. They could be included in the act here to make sure that the person who profits from his work at the end of the day has to pay him something. I think that's a basic principle in the right of ownership of intellectual property or any kind of property.