It was discontinued for four reasons;
1. Political. If it got up then the front man, the former President would have taken all the glory.
2. Cost. Approx 1 million to run it.
3. Applicability. Doubts over what a win might actually mean at the time.
4. Potential conflict of interest. AIPA at the time was in the process of getting Jetstar pilots into the Association. A win may have meant that Jetstar was illegal (it still may be!).
This 4th one remains the most contentious. However the Jetstar pilots have now seen for themselves what this management is capable of, and the potential offshoring affects them as well. Jetstar Australia seems to be headed down the same route.... offshoring of all expansionary slots.
You would have to speculate what the effects might be if the case was resurrected and Qantas subsidiaries were found to be covered under the Act. It may be that Jetstar would be folded into mainline, the same way that Australian airlines was. Would that be a bad thing for J* pilots considering the alternatives?
You'd have to ask the "A" pilots now in Qantas for that perspective.