2018 is shaping up to be a big year for the Avengers with the upcoming Avengers Infinity War. However, there is already potential spoilers being revealed for the movie coming after Infinity War. This spoiler has a lot to do with the fate of Tony Stark. There has been a lot of speculation that Tony Stark is going to be one of the characters that are not going to return after Avengers 4. For one thing, Phase 4 is going to bring in a lot of changes, especially with the buy out of 21st Century Fox by Disney.
One example of a spoiler is an image shown on Pepper Potts’s poster that shows her holding a severely damaged Iron Man mask. This gives a strong hint to the possible death of Tony Stark. Also, the original source material that Infinity War and Avengers 4 are based on does depict one of the characters sacrificing themselves for the world not through death, but through being trapped. Either way, Avengers 3 and 4 are going to be a couple of the largest events of the coming years. The magnitude of these films are going to compete with the Star Wars films.
Then Phase 4 is when it gets even more interesting because there are a ton of characters that are available for the MCU to use. It is highly likely that X-Men is going to join the MCU as early as Avengers 4. Then people get the chance to experience their favorite mutants on the screen like never before. This is going to be another big period in the MCU. However, there are people that are speculating that at some point, it is going to be time for comic book movies to step aside because the audience is going to be looking for something different. Perhaps after the MCU version of X-Men has run their course is when the movies start to wind down for the comic book characters.