I wouldn't put too much weight on JC Pilots being unwilling to move over the ditch. Demographics have changed over the years.
Plenty of Captains are either leaving, left or weighing up their options. China might pay more than a QF S/O, but there's more to consider than money when you're mid 40's with a young family. As for the FO's, well there's plenty of Aussies at JC these days...