The reason this doesn't work is because the blackout would have to be invoked again and again, and sites are reluctant to do this because it disgruntles users.

The reason this doesn't work is because the blackout would have to be invoked again and again, and sites are reluctant to do this because it disgruntles users. Lobbyists on the other hand have no problem introducing this kind of legislation a few times a year. We're already seeing resistance wearing off, especially since they're trying to be more gradual and fuzzy about introducing legislation that threatens the core of the internet.