The BBJ doesn't work well that's the problem. Too small, not enough range, too slow. They should have bought a 777/767/330/747 originally.
Aircraft that size will fly from Canberra to anywhere in the world non-stop with no need for crew positioning and various other logistics associated.
One of the biggest issues with selecting aircraft is the 'poor bugger me' attitude of the australian press. Politicians have to be seen flying around in a 210 as anything bigger is to pretentious. Fact is the 707 should have been replaced by a 767 at the time.