In just a few short months, Marvel Studios will unleash Avengers: Endgame, a landmark entry in the Marvel Cinematic Universe which is set to serve as the culmination of the first three Phases of the MCU, as well as a “new beginning” for the hugely successful superhero universe.As such, it’s expected that we’ll be saying goodbye to at least one of the MCU’s longest serving heroes in Endgame . We already know that Chris Evans (Captain America) and Chris Hemsworth ’s (Thor) contracts are up with the fourth Avengers movie, and now it seems we can also add Robert Downey Jr. to that list:Breaking News: @RobertDowneyJr’s contract ends with #AvengersEndgame pic.twitter.com/JDkxqS2ElO— Robert Downey Jr UK (@downeysduckling) December 24, 2018Now of course, this doesn’t necessarily mean that Tony Stark, Steve Rogers and Thor are all going to die in Endgame (the likelihood