For info, I have heard that the Georges River golf club (adjacent to Bankstown airport) has been, or is about to be sold to B.A.L. Interesting.
Moorabbin airport has had the additional land returned from lease to the council golf course now for 4 years or so. The master plan map shows an extension of 13L/31R and associated terminal for RPT, but it's only listed as potential development with no time frame. I would guess the land around the actual approach paths will soon be all factories and non-aviation related businesses. The only thing stopping the approach paths from being used is the land use requirements, but how long will that be in place if the runway extensions don't go ahead soon.