And by their proposal, the first couple extensions would be extremely cheap. It could be a simple form on some copyright.gov website to register your work.
5k/work is not cheap. That's how much publishers may pay for a book. 15k/work is prohibitively expensive for books.
Ok but what if the author had not written a successful book but still needed money for cancer treatment. Maybe we should handle social security and healthcare separately from copyright.
The same thing that happens if grandma worked in a knitting factory and got disabled. Most likely: state pension
So any work for hire, or other aspect would be expensive to renew. Anything owned by a corporation, LLC, or other non humane entity would be expensive.
But if the original author has maintained control of the copyright since it’s inception, I’d be fine giving them a much cheaper renewal price.