Did the show destroy the mystery of The Joker forever?
Even as Batman, the Identity of the Joker is still a complete mystery and that makes him dangerous and fascinating. Here? After bruce becomes Batman and sees the Joker.. "Jerome.. stop this now!".
No mystery, no drama. He'll know who to stop and that makes it boring. Unless of course, based on my previous post, Jerome is not THE Joker and a new Joker inspired by Jerome will show up.