As I understand it, the standard CAO exemption now is 100 hours flight duty (i.e. on board, not just in cockpit) in 28 days and 1000 hours a year. The exemption in any case limits duty time to 60 hours in 7 days and 100 hours in 14 days so crews' backs are covered somewhat there too. Any airline management that can't make money with those rules isn't trying.
I suppose it's always possible that V-Australia might try to get more but wouldn't count on CASA approval. This might be an area whcih could crystallize the coming together of AFAP and AIPA as any further exemptions would inevitably feed through one day to QF mainline.