I don't know that I'd say that the comic boom is dying down - in fact, thanks to the success of
Batman Begins/
The Dark Knight and
Iron Man in particular, it's really just starting to warm up again. Marvel have their whole intertwined universe kicking off, with Thor, the Avengers, another Iron Man, a Spiderman reboot, and an X-Men First Class adaptation, and DC have the third Batman, a Green Lantern flick, and possibly Superman and Wonder Woman films in the works. Add to that the independents like
Kick Ass and
Wanted, and there's really no end in sight.
This whole philosophy then leads to something like Eragon, the bombing of which might have put off many studios.
This is a good point, and illustrative as well of the kinds of fantasy that Hollywood does look to adapt - children's and YA (
Eragon,
Spiderwick,
City of Ember,
Potter of course,
Twilight). It helps that these properties are generally based on much shorter works than 'adult' fantasy would be, and are thus easier to fit into ninety to one hundred and twenty minutes of screen time.
If anything, I can see a possible boom in urban fantasy and supernatural romance, with
Twilight-esque novels being turned into films, following the success of that property. I do think that if George Martin's
A Song of Ice and Fire television series works out well, you might see more fantasy novels coming to the small screen - though it is important to note that this has been going on for a while already -
Legend of the Seeker,
Mists of Avalon, and
Earthsea being recent examples - with relatively minor success.