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Based on an earlier idea -- supposing the caped crusader doesn't get renewed interest in the Silver Age through the campy TV show, and declines in popularity during the Bronze Age of Comics. Even if he gets "rediscovered" by getting a dark reboot in the Dark Age, the damage is done; there are no Batman TV shows before 2000, and if he gets a movie before then, he'd be behind at least three DC comic heroes in priority.
What I'd like to know is, within these broad parameters, how is the comic book culture, industry, etc, affected? How is the DC Universe and fandom changed with the Dark Knight not holding them up? And what are the ripples from there?