If Schumacher directed a live action Batman film in a similar vein to Batman and Robin, it would've been detrimental to the character. The public up to that point only really knew the bright and campy version. Another live action film, the big return after some time, would've only gone to cement that view. IMO, fans of the dark and gritty Batman of early comics would've become a marginalised group, essentially the eradicated Jedi Order from the Star Wars movies. Knowing the truth but outnumbered by the sentiment of the day. It would have been possible to come back after it and film a B89/BR type movie, but the expectations and stakes would've only been higher.