Given that the DMCA is not a fundamental property of the universe, rather it's legislation. That legislation was written in a way to give both copyright holders, people who want to put content on the internet, and service providers a framework for dealing with copyright. If that framework isn't working out for all the interested parties, then it can be changed. When the framework isn't doing it's job, it should be changed. And in my opinion, part of that is that there should be no safe harbor for:

* content that is upload by users who cannot be affirmatively identified. * content that is uploaded by users who are not within the jurisdiction of the united states. * if a service provider implements mechanisms that defeat the intent of the law

Ultimately, yes, I get it that no one is required to host others' content. But at the same time we're not required to provide get out of jail cards.