That's an interesting question. I would turn it back to you and say, what do you mean by improving the effectiveness of notice and notice?
Are you proposing something such as I heard in a comment earlier, that the international treaties govern what we can do with people who are posting or infringing copyright from overseas? I don't know of an international treaty that lets me enforce against somebody who is overseas, so I don't know where you're going in terms of improving the notice-and-notice system.