What is the latest re industry consultation and proposed education re these proposed changes?
The proposed change of C over D to E over D will be interesting. I recall most if not all aeronautical studies involving C over D, the "why not E" aspect has been covered by words to the effect that if a higher level of service can be provided, then it should be.
I also note in the recent Aeronautical Study of Launceston:
At the time this review was being undertaken, Airservices Australia had proposed a trial of Class E airspace over Class D airspace volumes at Launceston and Hobart. There had been significant feedback from stakeholders to the OAR on this trial. This trial has been removed and replaced with the Airspace Modernisation project3. Under this project, there is no change to the airspace classification at Launceston.
Launceston Airspace Review - January 2019
And in one for Tamworth:
Class C airspace above Tamworth Class D airspace should be maintained unless a new aeronautical study using an airspace risk analysis methodology and cost benefit analysis can prove significant benefits for Class E airspace.