There may be links to other threads here, specifically the death of General Aviation in Australia.
Accusations are often levelled at CASA but putting regulation to one side it seems that most airport owners want GA to go away because they cannot make any money out of these marginally profitable businesses.
Every drop in GA movements is another reason to pull up a runway and convert it to sheds; is this what the Howard Government wanted? Given the enormous wealth of financial advice available to any Federal Government it seems difficult to accept that no-one in Canberra predicted that the new airport owners could make a motza if they could only get rid of those pesky aeroplanes!