Movies: I recall the opposite focus when Redlamp was around. He got excited for comic book movies to come out and would make wiki tasks to beef up certain characters and books to benefit those people looking for more information after having seen a movie. The movie influenced the wiki. (Spider-Man 3 is why I have so many points for Venom. I don't care about that guy, but it was a hefty wiki bonus.)
Comics: Allow me to gingerly state that I don't see comic readers as being as passionate about other forms of media as movie fanatics. Wikis are a form of media and there are some of us who love getting into the details. Look at the majority of top wiki editors on this site: they are basically just putting in data with some smatterings of substance. (And that is not a negative remark, this site needs those people.) Then there are others who strive to fill out every issue they read or pimp out every character they love.
I think most of the people, however, are content to read their books and discuss their views, at most, in a forum (and it's usually only the irate ones you see). This is an incredibly broad generalization, but I think it has some weight to it.