Not once in this discussion so far has there being any mention of the OAR, the section within CASA whose role is to manage the establishment of airspace (amongst other related tasks).
This proposal would be on their table somewhere and the OAR thru CASA have a responsibility to ensure such proposals are valid and balanced for all users and fully consulted with industry. Sadly however I don’t presently believe the workings of the OAR are being fully supported within CASA by some senior managers and an obvious influence by ASA who only want change to not cost them anything.