While I don't agree with most of BA Lerty's posts, the airports did have a hard time years ago with competitive tendering. They are still having a hard time as management doesn't seem to like long term staff and are doing what they can to make them leave. Whether this be with a redundancy or just leave.
I don't know what the Pilots and F/A's can do about it now as the rug seems to have been pulled from under them. The F/A's have BKK, AKL and LHR bases which are supposedly cheaper than Oz and the Pilots have Jetstar and Jetconnect to contend with.
One thing those of us left at QF can do is get involved with your union as there seems to be a willingness these days for all the unions to talk strategy amongst each other.