Anderson's posturing re the Airspace Directorate is just that.
In accordance with their Act and safety management system, Airservices must conduct a thorough safety analysis of any proposed changes to the air traffic management system, whether initiated from within or outside the organisation. If a safety analysis indicates that something is unsafe, then - someone correct me if I'm wrong - an Airspace Directorate would not have the authority to force them or CASA to implement it (nor does the Minister I suspect).