direct,
The Vote-of-No-Confidence is a good idea.
...but, unless it's published in the mainstream media, it may end up being received with an appreciative smile and then passed on to a newly formed advisory group of consultants who've been given twelve months to review a broad range of issues in aviation. The consultants present a preliminary report to the Minister in twelve months time recommending further investigation of issues raised during the review period, requiring more resources and time. The Minister passes the report onto another group of consultants with an amended Terms-of-Reference whilst issuing a public statement emphasising the importance of safety in the industry and the need to thoroughly investigate areas of concern...
...another twelve months passes and another report is submitted to the Minister raising concerns that the industry as a whole is in need of examination. The Minister issues a public statement announcing a major review of the regulation of the Aviation industry in it's entirety. CASA gets a name change, board members resign and new board members take their positions...
However, instead of a petition, if that Vote-of-No-Confidence was published as an Open Letter in The Australian, The West and The Age... it would become a political issue... with political ramifications... with immediate implications for the industry... the whole industry (paying punters don't fly when they read scary aviation things in the paper).
If you publish that letter, I strongly suspect that the Minister would get a phone call from the Chairman or CEO of QANTAS and Virgin Blue after the morning papers had been read over breakfast that day...