qantas doesnt need to amalgamate the two cabin crew groups. Their strategy is already to give the domestic work to Jetstar and the A330 work to Long Haul.
They will close the domestic division eventually under the current plan by the looks of things unless the domestic crew ensure that the nest EBA can compete a bit better with Jetstar. Cant hope to match them but a move in that direction will ensure better job security.
Trouble is that i think that Qantas is already contemplating the closure of the Melbourne Long Haul Base. If you are not on A380 down there flying to LA the remaining flying will be done by Short Haul or the Sydney Long Haul Base.
Plans are on the desk at the moment apparently