Yes. In fact, I think we will see more top players from Australia because there is a lot of support there for young players. What's going on right now with Kyrgios and Tomic has to be an aberration. Not so, I guess, in the US, where tennis has not had great popularity for a long time, though I suppose just one famous young American male could turn that around. But first it has to happen, and how can it with so little support?
What I teach is also elitist as hell - so-called "classical piano". I'm very non-traditional, so I work with kids from very average families (money.) But when you look at the kind of kids who do well in piano competitions, you see a ton of kids from China and Russia, almost none from the US. For instance, in Russia any really talented young kid immediately gets supported by a state system, so being wealthy is not a huge advantage. Here you can't get anywhere without money or support from wealthy people unless you are more in the pop or jazz fields, which is why I point students more in that direction.
As you know, if you are obviously a talented athlete in the US, there are people all over the place scouting for football and basketball. Tennis? Nope...