It will take at least Three heavy jet crashes to change the system.
The first will be put down to happenstance - Australia has had a good safety record, but statistically we cannot completely avoid the possibility that........... In other words; accidents happen.
CASA and ATSB will make suitable noises.
The second crash will be put down to coincidence - a statistical blip.
Questions will however be asked, and it is possible a Royal Commission will get up, but One headed by a "Tame" commissioner to keep the government and CASA safe.
The Third crash will arouse the public and will result in a full blooded Royal Commission, at which point it might be possible to effect change in the regulatory climate and regulatory structure that allowed such accidents to occur.
All allegations made against CASA will be met with calls for "natural justice" and "procedural fairness" to be afforded all CASA staff under scrutiny, irrespective of the fact that these same courtesies have allegedly never been granted by CASA to industry participants in the past.