At last week's world premiere of Batman: The Dark Knight Returns Part 2, Batman on Film reports that Uslan advocated for the idea, saying, "Now if I could put my 'fanboy hat' on, not my 'producer hat.' How cool would it be to see a Batman Beyond move? Bruce Wayne in his 80s training a young Batman. And how cool would it be to see Clint Eastwood as Bruce Wayne in his 80s?"
A similar premise, ironically enough, was in development as a live action film before Batman Begins found traction at Warner Brothers.