Hmmm; that sounds like me, except for the part about not wanting Worldcon to change. (Though I've been having slight urges to get to a Worldcon off and on for a bit now.)

However -- if Worldcon were mostly about TV and movie SF and comics, then I'd completely lose any interest I had; it would be dead to me. *Including* the good work being done in those areas is necessary and appropriate; but they're peripheral, they're not where the field advances (there's little theoretical reason they couldn't be, it's just my observation that so far they aren't; well, the cost of visual media does mean they have to serve a bigger market, and the collaborative nature of the production tends to interfere with consistency and clear visions). They're visually rich, but mostly do not have the real core of SF -- ideas, and thinking.