I disagree with that. Yes, there were superhero movies before Batman 1989 and Superman 1978 was one of them. But Superman didn’t begin a superhero/comic book craze. That void was currently filled by Star Wars clones. The aftermath of Batman though immediately gave us a host of big budget comic book movies and TV shows getting green lit: Dick Tracy, Rocketeer, The Flash, Judge Dredd, Tank Girl, The Shadow, Spawn, etc. There was a consistent stream of the genre hitting theatres for the next 20 years until Iron Man really put it into hyperdrive. That all began with Batman.