I think it'll depend on how successful/well-received the Snyder-cut turns out. It's all about the bottom line for WB and from Snyder's POV, they did give him a ton of money to finish the thing - and if their relationship during the reshoots goes well, he might want to dive back in just for the vindication if nothing else. He got **** for "dark superhero movies" when Marvel was hitting their stride. And then "Joker" happened. So, who knows?