CASA introduced the medical that was going to allow PPL pilots to have an equivalent to the drivers licence as RAA have, but they made it complicated and is equivalent to a heavy vehicle licence and almost the same as a Class 2 medical, probably only major difference it can be done by any doctor but a class 2 can only be done by a DAME. So when you get a RPL you will need an upgraded medical, bear in mind, in HGFA you need a equivalent class 2 medical pass to hold a passenger endorsement for trikes as I remember.
The RPL may make it a little easier for a RAA pilot certificate holder to progress to GA and get a medical and have access to control airspace and GA planes.
My point is the medical is an issue for a lot of people and the cost of operating GA planes, so these factors are not going to make everyone rush out and get an RPL unless they have the need.
I think CASA are trying to justify their existence as GA is dying due to high costs associated with Avgas, and the need to phase out leaded Avgas, the ageing aircraft issues including SIDS for Cessna's and Piper will surely bring out a similar program.
A few years ago GA schools did not care about RAA but now they are coming on board, LAME's did not care either but now they are chasing RAA work and probably pushing CASA harder to regulate RAA better to get more buisness.
My personal opinion is if you want control airspace or bigger heavier planes go get a PPL and don't try to turn RAA into GA as the costs will escalate.
I am finding most successful aero clubs are getting rid of their old GA planes and replacing them with RAA types, those that have old Cessnas are worried about future costs.