Originally Posted by metaphysician
There's two different usages of the term "over-saturation," here. One is the idea of "superhero fatigue", that people will get "tired" of superhero movies if there are too many of them. I see no evidence that this is actually a meaningful problem. The other is that if you have too many superhero movies, you'll run out of release dates. This is true, but its also not a problem for Marvel Studios so much as for the entire movie industry. Superhero movies compete for good release dates with all other demographically-similar movies; a big budget sci-fi or action movie is just as much competition for release dates as another superhero movie would be.
No there was one usage. You decided to make it two different usages. And the problem is not that people are going to get tired of the genre (which is a concern actually), the problem is if or when people start trying to capitalize on the genre. When a new genre emerges people start trying to capitalize on it which in turn causes eventual over-saturation which causes only a few films in the genre to do well and everything else to do not so well. This is why Marvel doesn't want to make 3 films every single year. They know there's a good chance with too many superhero films many will not do so well. Marvel knows they won't be the only big name in town in the next couple years.