What's interesting is that despite how many movies Marvel are pumping out, they are trying to make their movies in a way that you won't get burned out. For example, Iron Man started the universe and while we have gotten Iron Man 3, there's really no news about a fourth movie and we probably won't get one, at least for quite some time. Trilogies seems the way to go, and while Captain America 3 and Thor 3 are on their way, they have also branched out with Guardians and are continuing to branch out with Ant-Man, Dr. Strange and two presumable movies in Black Panther and Ms. Marvel.
Some studios would have just continued to milk that one popular superhero, but I love it that Marvel take a different approach. Sure, we'll get the regular core-team in Avengers 2 and probably Avengers 3, but instead of coming up with a sub-par Iron Man 4, they somewhat retire the character for a few years to leave room for other movies, and we know he will return in other movies anyways.