The problem, Aero developer, is the privatisation paradigm that means the true value of the aerodrome as a community asset does not get measured or paid for by the community. It also results in the mistaken belief that aviation users are being "subsidised".
What price the person who gets to life saving medical care more quickly from the bush, in an aircraft? What price the person who's found on an upturned boat in the Bass Strait, by a search aircraft? What price the felon who's spotted on the run in back street by a police helicopter? What price the commercial efficiencies arising from air transport?
The true value of an aerodrome is not measured in what you can charge for it per square metre.
The scam that's been pulled on the aviation industry by government is to not only expect to get the benefits of an aerodrome for free, but to get the users to pay for the "privilege". You've been scammed, too, by projections of movement numbers that were based on a once-vibrant GA sector that's been charged and regulated to near-extinction.
The inevitable consequence of not measuring and taking into account the value of an aerodrome to the community is that it must be turned into houses/factories/warehouses/DFOs/fast food outlets. The inevitable consequence. Unless you can pull off the 40 year right of refusal trick they did in Sydney - milk the monopoly asset for billions and pay not a red cent in tax. That's the deal you need.