This is an interesting point. To me, it feels like an old-form talkshow would be radio or TV. Both of these are subject to heavy regulation and corporate gatekeeping. That is much less true for Internet publishing. Although, as Internet publishing becomes more and more centralised, the same regulations and gatekeeping are likely to emerge in similar form.

The only people who think that the medium is the message are people whose focus is studying media, and not messages. Kind of like "to the guy with a hammer everything looks like a nail" type.