Superhero movies will never "go away." People love the extraordinary. Superhero film serials started in the 40s, and even the silent era had it's own brand of "super hero."I don't know why some people want superhero movies to go away. I mean nobody is making anybody else watch them in the first place. Even if they did stop making them, there's no guarantee they'd be replaced by something haters would like better. Heck, most of the people hatin' on superhero movies hate on everything else as well. So there's really just a lot of people who bitch for the sake of bitching.
There have been lulls, and I have no doubt another is due, but it will only be for a few years at most and they'll be "in" again.