Old they may be, but the role filled by the F-111 cannot be filled by any other aircraft yet designed, at least not as well and efficiently.
When they design something else that can drop a 2k lb lgb through your outhouse window from 50 ft up at the speed of sound in a mountain valley ringed by AAA, and then get out and fly home in time for happy hour at the boozer, no doubt the RAAF will replace 'em, but untill that happens, they are insanely proud of their 'Pigs' , and get rather aggressive when you point out the fact that they are a 1960s aircraft which look more at home in the company of Thunderchiefs, Phantoms and Skyhawks than they do with Hornets and Raptors.
Funny thing is, Amberley air base is only about 50km from here, and the first I had heard of this incident was this thread by Airboss in the O Club !:)
Local news didnt even give it a "Oh yeah, by the way, the zoomies at Amberley had another brown trousers moment earlier today when one of their ancient Pigs threw a wheel on takeoff"