Agree.
A320/A330 be a very short conversion.
A350 ULR only getting improved range and performance.
Lot of Airbus orders need to be converted from QF deferred A380s and the 90 odd neo firm orders.
Parts and Maintenance costs be lower with only one type being different(787)
Domestically QF and JQ would get economies of scale with common maintenance, spare parts inventory, loading, stairs etc.
A321 has a lot more capacity and range than a 737 too. Perfect for busy CityFlyer SYD-MEL-SYD. Almost 767 capacity.
A330 NEOs also very cheap and a possible A330 replacement in ten years or so too.
787 seems to be a point to point Ultra Long Haul aircraft on every route it's going to fly. PER-LHR PER-CDG MEL-LAX BNE-DFW?
Wouldn't be surprised if QF domestic/Jetconnect/Network/Cobram get the older A320s from JQ and JQ take the newest ala the A330s.