It wasn't the controllers who pushed for a 6 aircraft limit, they were just told to implement that.
If we actually complied with the published airspace policy the GAAPs would be class D, but plain ordinary ICAO Class D, not the Class D we use in Australia that is more like ICAO Class C. The problem is that we can be our own worst enemy. Instead of saying let's do what they do everywhere else in the world, that seems to work, we say oh no, we can't do it that way, we are special, so we end up with a mixed/amended/confusing system.
Plain ordinary Class D is almost the same as GAAP. It has an "implied" clearance, meaning just like we do now, we'd call up and say we were inbound and fly straight in. There is no cap on traffic, that's up to the controller. And most importantly, there are no reporting points. That's what all this review is about - the GAAP incidents/accidents. I'm not sure if the current plan means removing reporting points, I sure hope so. It would mean we'd call however many miles to the north, west etc rather than at Mayfield/Bringelly etc.
As for a new airport, I'm all for it, the more the merrier. I would imagine the costs involved would be enormous and the better the facilities, the more expensive it would be. Rated runway surface, lights, instrument approaches etc would not be cheap. Perhaps the people at Wedderburn would have some good information. Power, plumbing, car park. I think the biggest opposition would be from the locals. It is bad enough when people try to close down an existing airport, but imagine the opposition to building a new one.
Writing to the local member is one thing, but why not write to the Minister for Transport, Anthony Albanese? In fact, why don't all of us write to him? He's the one responsible for safety, so if we mention the danger of the overcrowded airports (2RN crash, and now with 6 in the circuit aircraft can be held outside the zone, circling around together over houses), he may be prepared to think about it. Maybe. And if he won't, maybe write to senators (like Bill Heffernan, Bob Brown) who would be prepared to ask questions at Senate Estimates.