Look, I hate to be the party pooper, but could it just be that the Avengers won't have a positive net effect on Hollywood because it's just not that great a movie.
It is what it is: it's shallow entertainment, and it succeeds at that. But honestly, the biggest problem with the film is that its fans, Bob included, are holding it up not just as one of the year's better action flicks, but one of the best films of the past decade. I'm sorry, but it ain't that special. Witty one liners do not a genre-buster make, especially when so much of the rest of the film revolves around the same tropes that have been pervading superhero films for the past fifteen years. The Avengers won't have a massive positive effect on Hollywood, because there is nothing innovative or different enough about it to cause such an effect. Yes, it has some good banter. Films have have had good banter and one liners ever since the talkies first came out.
Other than snarky one liners, all the Avengers has is spectacle. Like Transformers 3, along with practically every other blockbuster of the last few years, the Avengers will simply convince Hollywood to pour money into expensive CGI tech demos that show yet another city being destroyed by yet another extraterrestrial threat, probably by some sort of machiney looking enemy.
Here's the thing: the comics industry is an inherently shallow medium. When something great comes along, it's always the least important elements that are taken and copied by everyone else. When The Dark Knight Returns and Watchmen were released, did the comics industry then put out more stories focused on deconstructing the superhero genre, including multiple levels of symbolism, thematic subtext and psychological characterisation? No. They assumed that people dug violent, moody comics, and we got over a decade of comic book characters trying to outdo each other in the unpleasant, sociopathic violence stakes. When Nolan released Batman Begins, did the film industry focus on releasing intricate, deep stories that use superheroes as a tool to explore big ideas? No, they just assumed people really dug origin stories, and set about rebooting every property they could to get another origin story out there for people to see.