One minor nitpick: "Reducing the duration from "Year of Authors death + 70 years" down to, just "Authors death", for example, clearly couldn't lead to any given author producing fewer books."
You can't know that. Lots of make money specifically to leave to children, and for many others it plays a significant role.
I agree about all the other points - there is a lot of unknown in this field. I'm just not crazy about people saying "let's scrap this at least partially working system, and replace it with something I just made up". I'm especially not crazy if they don't even demonstrate a basic understanding of the issues.