Forget CASA because if they were interested, they would be in this debate already.
Problem is this - Technically the regulator regulates, enforces the rules and ICAO SARP's and if the rules allow (for
example only) - A third rate driver from a third world country to fly a passenger jet with a handful of hours under his belt then there is very little that can be done to change it. Simple.
Now don't PM me with hate mail as I also think the current tolerability is dangerous, at least the FAA could smell the writing on the wall and introduced changes. But as for CASA, well technically as long as the airline isn't breaking the law then they wont get involved.