I absolutely agree with ACMS. The new airport in Sydney needs to be built to continue to support the cities growth and the simple fact is that Bankstown is in the way of this and is of far lesser concern.
If we're going to direct any efforts surrounding this I'd recommend that telling them to consider Bankstown in their planning of the Airports design or operations is utter folly and will lead nowhere. Instead, we should be pressuring the Government to put together funding for the re-location of the various organisations that call Bankstown home. This only seems fair, they are removing their place of operations to support what is a financial asset being created. It's not too dissimilar to the Government deciding to build a highway through a person's home, they don't just turn up one day with bulldozers and tell them too bad, they buy it at a "Fair rate".