I'm a comic book/graphic novel fan, but this has to end at some point, right?
Over saturation is going to kill the genre in the movie medium.
maybe, but Hollywood is always short on ideas. Marvel's doing a pretty good job. This success allows other graphic novels to be picked up. Releasing two-three Marvel movies a year(Christmas, early Summer and late summer), IMO, is the best way to keep people coming back.
It doesn't always have to be Avengers movies. I also see them going deeper into sci-fi, and fantasy.
To me, the X-men franchise has become diluted, because Fox never took the time to develop anyone other than Xavier, Magneto and Logan. So they just keep pumping out the same film.