The relevant aviation authorities cannot say that change to flight and duty time requirements is required without implying that the current regulations are, at least risky. Currently they are implicitly stating that they are adequate and safe. Thus developing an improved system is difficult for them.
Don't know about that. How do you think the regulators therefore "get away with" improvements to every other aspect of aviation? Certification of aircraft, introduction of better and safer equipment etc etc? Because most of the people that count know that nothing's perfect and can always be improved.
Anybody who rips into CASA or tries to take them to court for "improving" DTLs deserves to be shot. The big question is, who are they "improving" them for?
