The problem with that approach is that it would be trivial for companies to produce volumes of work and information demonstrating that it does.
Do you really think that someone like archive.org can do a better job of proving the negative than DisneyDiscoveryWarnerComcast will do producing volumes and reams of information demonstrating how they can only afford to keep making new content and supporting small creators if copyright lifetime is extended to 500 years?
Do you really think that someone like archive.org can do a better job of proving the negative than DisneyDiscoveryWarnerComcast will do producing volumes and reams of information demonstrating how they can only afford to keep making new content and supporting small creators if copyright lifetime is extended to 500 years?
IMO compulsory licensing is the way.