I like the idea of having copyrights renewable indefinitely, but with the holders having to pay exponentially larger sums.
I'm okay with large corporations pouring their money at the government to keep copyrights for useless things alive, even if it means we can't legally copy useless things for a bit longer.
Btw, if I'm not mistaken, I first read about this proposal in the book "Radical Markets: Uprooting Capitalism and Democracy for a Just Society" by Eric A. Posner and Eric Glen Weyl
https://press.princeton.edu/books/hardcover/9780691177502/ra...
Derivative works have their own copyrights. The original book is free for grabs but each movie franchise has it's own copyrights. Likely far more valuable and ones the original artist will never see a cent from.