Imagine having a huge success and ruining the sequel by making it a musical AND writing a stupid ass script that some random dude on YouTube actually makes interesting.
I forget the video but the idea was to make it so that the second movie focused on the actual 'Joker' mystique and the group of people that were Joker fanatics. He would NOT second guess himself but would still end up losing control over the Joker fans because he's not actually that smart at which point he still gets killed by the real Joker. This idea is so much more interesting since it focuses more on the the idea of Joker/Batman being an ideal instead of just a specific individual AND it also works with 'The Batman' which had the Riddlers fanatics