Theoretically when CASA do airspace audits (which they did of the Melbourne basin some years back) those sort of issues are supposed to be raised when they consult operators etc.
Airspace Reviews - CASA
I recall when Airservices proposed the lower step north of Melbourne I mentioned in another post, they were asked for written evidence from all the operators requesting the change.
As for the Class E business, I assume Airservices have had their hands smacked by putting something out to industry before doing their homework and following "due process"
