Part VI has little to do with the topic(s) that has (have) dominated the first five parts, but the debate on these things rages on. On the topic mostly of Part IV, Comixtalk points me to Valerie D'Orazio's rather doom-and-gloom scenario for webcomics and the Internet in general, as well as Joey Manley's response.
I have to imagine Manley didn't read D'Orazio's post very carefully. DC and Marvel are only ever presented as examples of companies that might take over webcomics; and even within the body of her post D'Orazio states that her scenario is more a prediction than a hope, no "backtracking in the comments" involved (though her simultaneous seeming exhortations to the mainstream media to adopt her plan could have easily confused Manley; she really is positing multiple predictions, either the "MSM" adopts her plan or they die). And Manley's claim "no one at DC or Marvel would have picked up xkcd" is mostly irrelevant; since it's so popular now, D'Orazio would argue, they certainly would. (But what happens to the Randall Munroes of the world after webcomics get corporatized? D'Orazio doesn't really elaborate.)