The economics of TV and the Internet are different. It is easy to provide sites where people interact, we're on a perfect example of that. However it is not so easy to guarantee access to those sites.

The issue that he is raising is that ISPs have the ability to filter content. So far in the USA this ability has been used for relatively benign purposes, for instance optional content filters to keep your kids from seeing what you don't want them to. But precedent in other countries shows that the same technical ability can be used to censor online speech in very non-democratic ways.

Cheers,
Ben