My 2 cents worth at this point...
We have tried the separate administration of rec flying and it has failed. (x4, apparently - even with guidance)
CASA will now be looking at having more oversight in the new RAA to prevent a repeat performance. They may even take over some governance issues totally (Issuing L2's, reporting/actioning of incidents, etc). Clearly the dust has not settled on this yet at all.
Why then not cut out the middlemen?
Why not simply keep it as amateur built, and factory built, up to 2 seats, and up to and including 1500kg MTOW, per the recreational licence now permitted by CASA as a stepdown from the full PPL?
There would be a lot of crossover and a lot of benefits to having the CASA rec licence and administration (CTA, aforementioned STC's, proper investigations of incidents with FULL reporting, etc), and it may be possible for current RAA qualified trainers/organisations to get qualified in the CASA rec licence.
Anyone says anything about "cost..." only needs to look at what the "cheap" version has achieved....not so cheap with $XX000 worth of aircraft sitting on the ground, deregistered and not able to be used. Ya gets what you pay for.
Maybe it is time to look at this as an opportunity for a rethink of recreational aviation's "placement" rather than leave it as a rehash of everything that went wrong last time. We have the opportunity to improve our pilot training, gain CTA access, welcome a whole host of new members (CASA Rec licence holders), allow larger aircraft for training and use, and improve our image as a responsible organisation.