If a 2nd Airpot was constructed, how many of us would actually prefer to use it over Sydney(YSSY). If it:
-Is miles and miles out of Sydney, its pointless, not pointless for the Sydney population
-The airport needs to be on a train line, because Taxis, Buses take time, and cost to much, so a cheaper fare/regular fare can skyrocket
-If Tiger does eventually use Bankstown, tourists could become lost, and the transport factor again, and I repeat, its great for Sydney Population(as they have cars to and from airport), but for us youth for cant afford mega fares, the 9.95 fare can turn into a $50 fare!

In the end, I will use Sydney Airport, not another proposal, as YSSY is in the perfect location with regards to Transport, and great for Connections (I wouldn't like to connect from one airport to the other)

Again, this is MY opinion, you could have a 100% opposite thought, anyway