No way in the wide world AUS can sustain QF, JQ, VA, Rexy & Bonza.
The amount of $$$ that will be wasted/lost, once any take over happens there'll be lot of burnt $$$ to get to that point.
Not sure it's all about "sustaining" the different airlines? The ultimate goals of the PE$ is to shift those wasted to $$$ on to some poor sucker who has no clue, by getting in, tarting it up, getting out and making some money (and incidentally leave a trail of damage behind them). At least with the US PE firms behind VA and Bonza that would seem to be the case.
Not sure what the Singaporean PE firm, PAG is doing, they don't seem to be doing a lot to "tart up" Rex though. Quite the opposite.