I feel like it would be a good idea to have a law that says that if you failed to reprint a book for x years then it's okay for a library to digitize it forever, and allow it to be used by its patrons. This happens right now in some libraries, where you digitally "check out" a copy of an ebook, which theoretically limits supply and therefore limits the harm done on publishers.
Yes, all forms of IP should have a "use it or lose it" mechanism. Work the patent or lose it. Market and enforce the trademark or lose it. Keep the copyrighted work available or lose copyright protection.
