gulliBell, Just a guess but I think if there were population and or hours flown commercially comparison between Australia and China. That 40,000 plus training hours may not look very good.
Australia has probably been doing about enough training, but I think we will find far more Australia pilots are working overseas than 457 pilots in Australia. We have been loosing our pilots to other countries for a long time now.
The answer is "why do they leave"?