That's an interesting thought as Australia and the United States have generally had a mutual respect for basketball in each other's countries, unlike the relationship between the United States and most of Europe. I think part of the reason is that technology has advanced to the point where the recruiting process is easier. It's now getting simpler for players who are not the top prospects to get film from local club play that they can easily send to colleges, reducing the mystery level. Australians themselves generally do not believe that their recent prospects are any better than the relative level of prospects that they had in earlier generations and some of them are actually quite critical of the quality of player development there right now.
If your theory is correct, it will be very interesting to see how things change in the next few decades. Australian Rules Football has become a viable professional sports option for women now and it is the first love of many Australian athletes who have been competing in other sports, including many basketball players. Basketball was already behind netball and soccer and also competing with individual sports, but they may now be even further down the list. Here, basketball certainly competes with volleyball and soccer, but is not behind other sports like in Australia.