The comments about one body knocking another are, frankly naive.
One of the weaknesses of the Australian bureaucratic system is that it only deals with peak bodies (unless you have Dick Smith's profile). And it only likes dealing with one peak body per interest group. So, to be heard, you kind of need to create differentiation with current ones.
And its hard to argue against the fact that the AOPA has deserted GA - or at least IFR and business / private aviation.
There is plenty of evidence.
Look at the way they sold out IFR for ADS-B
Or go to its website and look for recent Canberra submissions
Or just look at its board and see how many live in Sydner and / or have been there for a million years - oops you can't because they took it off the website.
Or you can look at the Annual Report for a sense of what they are doing - oops, that's gone from the website too (is that even legal?).
The more people that make noise the better.