The Associations are now neutered. They are inside the policy bubble that is GAAG. That means that they are stuck having to sell the Government policy they are made privy to and have a hand (well even a little finger) in developing. They become party to policy by osmosis' once the secretariat lets off a paper foreshadowing changes, they have one chance to object - which will cost them membership of GAAG, or they are stuck selling it to their members.
If a PAC is to get up, it must be separate and at arms length from the associations so that they have plausible deniability or they are off GAAG. Of course ideally GAAG won't include reputable members and can thus be ignored, but there is always some wood duck who falls for the "change from within" fable.
The more ominous threat is allegedly CASA authority to approve, meddle in and withdraw self regulating status to the various associations. This allegedly includes approval of individuals in charge of said associations, the ability to license competitors, or not and suchlike Orwellian controls.
I posted about this before:
The Kapo System Of Aviation Regulation and CASA