Fleet review could have something to do with the number and location of the 200/300 fleet. No doubt linked to the rumoured expansion of JQ NZ Regional.
Recently the BNE-based Q300 fleet went from 4 aircraft to cover 3 lines of flying to 2 aircraft for 2 lines of flying. The recent rationalisation of the QLD flying had an extra Q400 covering the flying. An all Q400 base in BNE would also create crewing efficiencies.
I may be wrong, but I'm sure the Q400 can go into Charleville and Thangool now.
That would see the 'classics' based in SYD & ADL. The WYA route loads will be interesting given the local economy lately.
All the above is an opinion only so take it with a grain of salt.