If I'm a photographer, do I need to pay extension fees on all my thousands of works? Does my neighbor who makes movies only need to pay one fee? What if I make a book containing my photographs -- is that just one free? Can Disney make one long 40 hour movie containing all their stuff together and count that as one work?
Maybe you can declare the value of your IP and the government taxes you like 2% on it. I don't think this would really work but I'm tossing it out anyway.
This is just a way of saying that the vast majority of individual photos don't represent a lot of creative work, and hence are a lot less worthy of protection. I would imagine that even a major photographer such as Ansel Adams wouldn't have more than a dozen photos earning good money more than a decade after the photo was first published.
My objection to steko's idea would be more that it is precisely the most important works that we are going to want to copy / create derivatives from, and yet these are precisely the works that will be the most able to perpetuate their protections.