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After the DC Extended Universe got off to a divisive start with Man of Steel and Batman v Superman: Dawn of Justice polarizing both critics and fans, DC's biggest heroes have been in a state of uncertainty, and a Batman and Superman team-up might be the thing to stabilize it again. In an effort to course correct for the complaints about Batman v Superman's tone, Suicide Squad saw massive reshoots, ultimately making the movie a mess, with Justice League taking even more drastic actions, removing Zack Snyder as director, cutting continuity to his past films, and permanently altering the future trajectory of the DCEU.
In the time since Justice League, the future slate of movies has been significantly altered, with release dates being pushed and new characters rumored to get their own movies, but news on Batman and Superman's next outing has been scarce, with even Matt Reeves' slow gestating Batman solo film reportedly telling a story about a younger Batman instead of continuing Ben Affleck's arc.
Couple this with repeated news that there are currently no plans for Ben Affleck or Henry Cavill to suit up as Batman or Superman again, and the future of the characters is in doubt.