There’s a simple reason for this: if they recast Ben Affleck and immediately jump into a new Batman, the shadow of Affleck will hang over the role for years to come.
First and foremost, if Ben Affleck decides to walk away from the Batman role, then Warner Bros. And DC should strongly consider taking his character off of the table for the time being.
No movie has ever killed Bruce Wayne, and now may be the time to give it a shot.
We need some time to breath in between Batmen, and killing Batfleck is the way to make that work.