Just by way of a query; what's the difference between business jets landing regularly at BK, bank runners operating quasi-RPT, turboprop charter operators and a multitude of C152s as happens now, and then an additional A-319 operation? Other than an additonal few hundred people a day and the word "airline", then not much. But the pollies have to pander to the voters and even moreso to McBank.
The proximity to Sydney is just an excuse. LAX is close to Longbeach and Burbank with a couple of GA fields in between. It can be done if someone wants it done and alternatively, it can be quashed if someone wants it quashed.