Alan recently did quote the 787 is too capital intensive for triangle routes. Jetstar do run a lot of 321 flights MEL/SYD.
All eyes will be on Virgin and it’s MAX 10 introduction. Most certainly appears to be a gamble that will pay off. QF has probably missed the boat before Western Sydney opens for any MAX 9/10 order and VA will have about 4 years of the extra capacity before it opens.
Never understood why nobody went for the -900ER. Great workhorse USA Domestic and would be a good fit for Sydney.