I've always expected that a system which could work, albeit with flaws, would be to ratchet up censorship for any individual user who flags content. The more they flag, the less they see. The only 'problem' is that this would leave users fearing that there are others who have not flagged the same content objectionable that they have, and are viewing that content without being actively prevented. They'd be protected themselves, but it would be easy to convince them (if any convincing is even necessary) that 'almost everyone else' is consuming the raw obscene feed and being turned into monsters by it.

This already exists on Facebook.