When creating multiple movies, it would only make sense for the same person to play the same character every single time. However, this has not been the case in the Batman series of films and multiple actors have played the role of the superhero. One of the most respectable actors to ever play Batman was Christian Bale.
Last year it was announced that another actor would be reprising the role of Batman. Since then people start to wonder why Christian Bale is being replaced, and Bale, the key figure himself, initially responded by stating that he was disappointed with the decision. He also states that it was his time to go and that his last role of Batman was wrapped up nicely in the last film that he stared in and that there was no reason for him to keep going with the role since he had essentially wrapped up the character that he was playing.
Bale also came under fire for his behavior and essentially needed a break from the world of acting. So while the world may be disappointment and while Bale admits that he was initially a little jealous he states that it was his time to move on.