Here's the quote from Forbes' Mark Hughes:
"Unfortunately, among the things I heard about his departure as director, I heard a few specifics that — if true — lead me to worry there is at least a chance Affleck could also walk away from starring in the picture. I don’t feel those concerns are as likely to bear fruit, and I still expect Affleck will finish the screenplay as planned and then start prepping for the role by getting into “Batman shape” to ensure he’s physically and mentally prepared for the role. That said, I do believe there’s a chance now that Affleck could depart the project as an actor, winding up merely serving as cowriter and producer."
May the Force be with you.