CASA will have suffered "Regulatory Capture" by Qantas years ago, They would rather hit their dear Grandmother over the head with a two by four before than they would bring Qantas to account.
As for Ministerial action - forget it, look who the Minister is and where he is from.
Sadly, my prediction is that it will take not ONE hull loss but TWO or THREE, before the politicians are sufficiently aroused to overcome the existing pro Qantas bias in matters aviational and start lopping heads and fixing things up. (Ain't that "Chairmans Lounge" a wonderful investment?)
And of course by then the culprits will be long gone and have stashed their bonuses in trusts and put their houses in the wifes name.