That's what Qantas is for. Your summing up is right. They need to focus on Jetstar filling the gaps ex-VirginBlue is leaving now they can cater for less general domestic economy seats and Qantas needs to go on the attack for the business travel.
But on a 737 QF has only 12 J seats (DJ 8).
On a 767 fine 30...
But at the end of the day most of the money is down the back, and now that JQ and DJ have frequency that gets close to QF, that hot scroll/ apple or complimentary alcoholic drink after 4 aren't worth the $50-200 that they used to be...
It then returns to costs.