Interesting there E.P.
Hard to believe though because of the Q/A list guys already flying the bus domestically and shortly, internationally. Somehow I doubt they will take kindly be bequeathed to Jetstar.
Would also require a massive backflip by QF.
Besides, they already have their all economy carrier in AA. Sorry, giving A330's to Jetstar just doesn't make sense.
However, given the almost total accuracy of your initial post, you have me intrigued....