Its a vision thing....... The vision of the Governments of both persuasions, CASA, Airservices, the airlines and the RAAF is that GA and recreational aviation are, at best, forms of "Air Pollution" and at worst potential terrorist threats. The vision of property developers and local Government is that all airports are Greenfield property development sites. The perception of the general public (in cities) is that GA and recreational flying is for rich silver tails.
In my short time as a pilot and aircraft builder, I have not seen nor heard one bit of support. let alone encouragement of GA from anyone in government, period.