Great post OME,
You stole most of what I was in the process of writing.
Sadly from an aviators point of view, Bankstown Airport is constantly shrinking at an alarming rate to commercial and industrilal development. The green area's are getting smaller and smaller and replaced with what seems like an ever growing amount of building sites. In the southwest corner of the airfield where I used to enjoy Schofields Flying Club plus others, there is now a warehouse so massive it needs to be seen to be believed. I looks almost big enough to put a runway on it's roof.
The aviation museum has gone, and many others.
As you rightly point out, so many have suffered as a result of the airport being leased out. The sad case of Clamback & Hennesy to mention just one, who had built up their business over decades, only to have many years of hard work and investment virtually stolen away from them, due to conditions imposed by the new leaseholder and no compensation.
Unfortunately, it seems that those with a vested financial interest in the almighty dollar, always seem to come out as the winners.