If you include Big Hero 6, there will be six this year, which is pretty much consistent with every other year since Raimi's Spider-Man. There are usually four to six per year, and there are more movies of pretty much every other genre released annually.

Next year only has three currently on the calendar-- Avengers 2, Fantastic Four reboot, and Ant-Man. Only three on the calendar for 2016 too, if you believe the rumor that ASM3 is being bumped to 2017. That's a far cry from over saturation. There will more biopics in an Oscar season month than superhero movies in a year.

It only *feels* like oversaturation because the reporting on them and other major franchises is FUCKING ENDLESS. And that does get super-irritating, and it does make them feel like a never-ending presence in our lives.

But they're not actually overstuffing the calendar with superhero movies. They're too expensive to make for the calendar to be *that* full of them anyway-- pretty much every single genre is cheaper, and will result in more releases per calendar year.

The "people of differing taste" likely don't object to superhero films specifically, but to any summer film with huge CGI spectacle. In which case, yeah, they're kind of fucked for three to four months unless they have an indie theater they can go to. But seeing as how there are endless amounts of wonderful movies for those people on Netflix/Hulu/iTunes/VOD/for rent in public libraries, I'm not terribly sympathetic. It's easier now to see low-budget indie fare, either old or new, than ever before.