it would be fair to say that the union (elected officials ) totally supports the seniority based preferential bid system. (warts and all)
However as always it is a matter for the membership. The union can only do so much and if the members are convinced that line bidding is the way to go it would require a vote of the membership as it would be a variation to the EBA.
From a personal perspective i have always believed that some choice is better than no choice. but in the case of Melbourne and that almost mad beehive mentality they are clearly capable of throwing the baby out with the bathwater it seems