It can certainly look like that...
Aussie kids have so many choices on how to spend their leisure time plus there's a certain coolness in not appearing to try too hard. In contrast, for many of the countries in Asia, football is the way to a better life and players are desperate to succeed. They tend to be a bit more nationalistic than us laid-back Aussies also.
So yes, while it wouldn't apply equally to every individual, I suspect you're right about passion.
So we'll just have to win with our superior fitness and technique.