I mentioned it in other posts.
CNN doesn’t exist in those pressers as long as Acosta is their guy and trump rightfully ignores him. And if they finally pick someone to replace him and voluntarily try to swap them out, nobody is REQUIRED to give the replacement a hard pass.
In the short run, CNN looks oddly vindicated. In the long run, well, it just may be checkmate for Trump that goes to the heart of CNN, not just Acosta.