Be aware that CASA and ATSB are playing for time.
Once the Government enters "caretaker mode" then everything must wait for the New Minister.
Once the New Government is appointed, then a whole lot of delightful documentation is locked up under the Thirty year rule.
The whole process resets and starts again from square One if the new Minister is successfully "captured" by his Department head.
My guess is that the public service will be lobbying Liberal party powerbrokers and anyone else who will listen that anyone but Sen. Fawcett should be the Minister.
The Department line will be that at all costs Senators Fawcett and Xenophon (assuming they are re elected) must be kept at arms length the Aviation portfolio or they will "make trouble" for the Abbott Government.
If I were Sir Humphrey, I would most probably phrase the matter of CASA and the ATSB as "an unneccessary diversion from the main game Prime Minister."
I dearly miss my spy in PM & C, I would love to know their opinion of Mr. Mrdak