The TV channels are a different matter. They are, today, right now, happily making $2 per viewer hour, and Apple is offering them effectively $0.70 or so (let's say the average TV show is watched by two people in a household; even if it's only one, that's $2.00 vs. $1.40.) The TV networks aren't threatened by a Napster equivalent. And the people who really might benefit from Apple's business model -- content producers -- are tied up in an existing business model that's hard to wean off of.
It seems to me that it will taken people like Joss Whedon or Rob Thomas (Veronica Mars) -- the kinds of people who could Kickstart a movie or TV season -- to try their luck at selling content direct to consumers (through Apple, Amazon, etc.) to convince rightly skeptical content producers to ditch the useless middlemen.