The issue of Fatigue management is not in question.
The real question is "would CASA, have implemented fatigue management regulatory change of its own volition, absent pressure from ICAO, FAA and the Norfolk ditching?
I fail to see it as anything other than a reactive organisation, not proactive at all. Since when has ATSB or CASA ever sounded the alarm bells to the international aviation community after discovering something truly hazardous on its own?