Personally I agree with
ulm (also be involved with AOPA, 02 9791 9099) and we need to form a local action group to save the local GAAP airports otherwise we will need to look elsewhere and travel further. If you need to look else where for training, that's what you will have to do, but at least try and fight to keep the major airports from being over run by the greedy developers.
AOPA Australia If you do need to move, I have found
Warnervale Air Pty Ltd and excellent Flying School for doing your flying training. They do every thing from GFPT through to CPL.
(I did not say they are perfect, and no school is, if you find the perfect school you can let us all know.) 
They have very good instructors, and the aircraft are reasonably priced compared to Bankstown as they do not have the expensive landing charges and expensive operating charges & associated costs. You will find the Central Coast Aero club a great bunch too if you looking for a good social group.
(If you’re a member you get a discount on the hiring of aircraft from Warnervale Air Pty Ltd, plus many other benefits.) If you need more information give them a call on 02 4392 5174
If you’re a private aircraft owner you will find it a lot cheaper keeping your aircraft at a place like Warnervale, Wollongong or Goulburn etc. You need to look around and compare the costs and charges.
