If Michael Keaton was never Batman, other actors who might have pulled it off
Kurt Russell: He would have been able to bring the character depth that Keaton did and given the character the more tough, physical aspects of Batman as well.
Billy Campbell: He certainly looks like Bruce Wayne stepped out of the comics and grew his hair out a bit! I like Bill a lot for Bruce Wayne, but not for Batman. More’s the pity. In 1989, the idea of masking Batman’s voice with an electronic distortion wasn’t part of the film; had that been the case, he would be a much stronger candidate in my book.
He was good in “The Rocketeer”, and I think that was a good fit for him, and though he certainly LOOKS the part, I’m not sure he could have been a good Batman
Ray Liotta: He was offered to audition but turned it down, but later regretted it, he would have handled the intimidating side of Batman, no question, but he also could have captured the human vulnerability of Bruce Wayne; which is a juggling act of emotional range not every ‘80s leading man had.
Alec Baldwin: say what you want about his private life or controversies, but he could have pulled it off in the 80s, especially if he bulked up like Cavill or Bale did for their roles. Also he looks like Bruce Wayne from the 70s comics
Others who were considered
-Mel Gibson: Good choice, but too short
-Harrison Ford: Good choice, but was probably too big of name
-Pierce Brosnan: He'd make a good Bruce Wayne, but Batman IDK, had he gotten then he wouldn't have gotten the chance to play James Bond
-Kyle MacLachlan: Would have been young enough to carry the series and grow into the role
-Dennis Quaid