This sounds like deja vu, from the time when the number of controllers at Jandakot was halved (about 16 years ago?) and the tower had to close at 6 when it is still really busy, sure enough someone landed on top of someone else just after the tower closed.
Is it true that controllers are coming in on 457 visas?
Yes there was revenue before user pays, buckshot, from the fuel levy. The excise duty we now have is about the same amount as the levy was and we have user pays as well.