Hang on . . .
There is a big difference between an employee whose job involves copyright and one whose job relies on copyright and would be in danger without it.
Take on of the examples given - The Arts.
There are composers and writers but there are also performers. Orchestras around Australia, for example, predominantly play works that are out of copyright. They do so because they are free to perform. The same goes for other arts companies. Just look at what happened in the US when, in 1994, Congress finally brought the US into line with other countries by extending copyright to cover foreign works, thus effectively removing thousands of works from the public domain. It was challenged in the Supreme Court because it would put jobs at risk.
Similar applies across other industries but the above is just to make the point that free access to works is very important for some jobs