WB should just focus on the solo films for now before thinking about this extended universe. It's a shame Cavill is leaving, I loved Man of Steel but I'll admit the movie didn't give him much to do as an actor. I also liked BvS but that movie did nothing for him. Justice League was just weird.
He was never truly given a chance to shine so I think he made the right choice to leave. WB obviously wasn't in a hurry to give us a Man of Steel 2 anyways. They can't even get a new Batman movie going.