At one bite at a time for a skyscraper, that won't happen in my lifetime LOL. I take the movies for what they are, mindless fun entertainment that lets you relive some of the characters you grew up on.
As for the well running dry, I don't see that happening anytime soon.
1. Deadpool - low expectations, yet highest grossing R film in history
2. Guardians of the Galaxy - Low expectations, yet high box office
3. Ant Man - Not a highly regarded character, yet solid box office again
4. BvS - I think is a mediocre move, yet solid box office
Based on Pre-Sales Numbers for Civil War Captain America, you are looking at another box office behemoth that should be the highest grossing in the series.
Do I like a variety in my movies, drama, chic-flics with the Mrs. etc, yes, but I will always enjoy a solid 2+ hours of mindless fun 2-3 times a year