Great article - had me rolling on the floor laughing.
I can't see a second SYD airport happening anytime soon, given the politics. SYD has been a problem for 30-odd years and they still can't (or won't) make a decision.
Increasing congestion at SYD will eventually make the place unworkable. That roadblock will harm the NSW economy, but will encourage economic opportunities elsewhere and the international traffic will follow.
I agree with Ben - let it die.