You would need to change more than the DAS to get a meaningful reform in Australia and the political will for what it would take is not there.
You need either all segments in Australian aviation to form a common front, which is highly unlikely as they can barely agree on what day it is, or, the FAA or EASA to conduct an audit on Australian aviation and rate it as a fail. The fallout would be enormous. It nearly happened but Australia was let off the hook as they argued that the planned changes would address the concerns.
triadic, just seen your post. You never have a review unless you know what the outcome is going to be and I can't see this government being concerned about massively changing CASA when you can get away with fiddling at the edges. Hope I am wrong but I am not going to hold my breath waiting.