7. Zack Snyder Wanted Bruce Kent To Take Up The Bat-Mantle - Zack Snyder's Justice League
Not content with completely tearing up the first attempt at bringing the DCEU's Justice League into being with his own 242-minute monster of a director's cut in 2021, Zack Snyder decided to eventually explain what the future would've looked like had the rest of his super-vision been followed through on.
Snyder would've had Ben Affleck's Batman ultimately sacrifice himself in order to save a pregnant Lois Lane from an incoming Darkseid, an event that would create a timeline that didn't actually see Supes fall under the control of the big bad entity; as seen in the Snyder Cut's Knightmare sequence.
Said sacrifice would've then have paved the way for yet another "reboot" of sorts later down the road, with Snyder noting to GQ that a future Justice League story would've involved Superman and Lane's son taking up the Bat mantle:
"Then the end is this epilogue where it's 20 years later, where Superman's son has no powers. He's born without the powers of a god, but then in the end, he would have become the new Batman... Then it would have been a reboot after that. You can just go back to the beginning again, where you could do a small movie with the new Batman or something."
Had this reality come to pass, there's a strong chance fans would've never been treated to Matt Reeves' recent critically acclaimed take on all things Gotham. So, it's probably for the best that Snyder's planned never-ending Bat-saga was nixed in the end.