Only a relative handful of them — porn, dating services, adult-themed chat rooms, R-rated movie sites, et al. The others would simply have to tone down or pare down their offerings. Merely creating a new domain wouldn’t create a neighborhood or safe zone for kids. Palestinian textbooks about the Israeli occupation of the West Bank? Taliban cartoon primers for young girls about their proper role in an Islamic household? Surely if you’re going to spend 2,000 words on a topic like this, you’re obligated to at least mention the single biggest obstacle in its way?