Threat?
There is no real threat from Glen or APTA in my view, sure it's uncomfortable for a CMT and a Regional Manager to admit they got something wrong but I doubt that's central to the issues. CASA has fundamentally failed to understand outcome based legislation, look at the prescription that doesn't exist in the first CASR's published, and look at the prescription that is in the more modern CASR's, Parts 141 and 142 are more prescriptive than the regulations they replaced. Assessments under the new regulations are achieved by inspectors reviewing documents against checklists with obscure and often irrelevant criteria, in the name of compliance, oh wait, did they mean safety?
There is no threat to CASA, not individuals, not organisations, not other government agencies or departments.
If you want change you need essentially two things, it will come down to someone/ an entity with the will to make the changes who has the authority to see it through. You don't have a wholesale change in aviation legislation and oversight if government thinks your ICAO ranking in the top 10 is real.