I think we're at a stage in our copyright evolution that contemplating something like a graduated response.... I think “three strikes”, by the way, is one of those terms that has been applied to it. It's like a pejorative term, to make it sound worse than it is. A graduated response is what it is. But I don't think we're at that stage here.
What's contemplated is a notice and notice. Will notice and notice work? Notice and notice can be a fabulous educational tool, but without consequences it can pose a long-term problem.
As for notice and takedown, which I think Charlie hates, it is entirely different. And by the way, everybody else in the world seems to have it and they don't seem to have a problem with it.