That's why the notion of expiring copyright works out. I didn't suggest removing that. And sure, there's plenty of room in between there. What would call for, then? If there is any demand, the owner of the work needs to front the expense to fulfill it, otherwise lose the rights to the work? There are lots of ways for this to go wrong.
Anyway, copyright is already a mess, and it will only get worse over the next decade. It's worth talking about it.