Affleck completely resigned from his role as Batman and then returned to a variety of supporting roles following Justice League's Snyder Cut was revealed.
As for the rest of us, Henry Cavill and Warner Bros not negotiating an agreement that would have kept him without a cape for a long time with nonsensical Superman appearances replacing his.
Announcing Henry Cavill and Ben Affleck returning as DCEU's Superman and Batman could provide a sense of certainty about
Cavill & Affleck's DCEU Returns
If the news comes out that Cavill as well as Affleck returning for another time Fans and the public are assured that all details will have been removed simply due to necessity.
The details of what Cavill or Affleck's comebacks may appear like is an entirely different issue entirely.
A World's Best partnership or the Cavill's Superman finally battling Black Adam are scenarios of similar
Cavill & Affleck's DCEU Returns