China will probably be a contender in like 20 years for basketball. Basketball is incredibly popular, and the average male height has grown significantly as they embraced Capitalism.
Youth Soccer is popular, but at least in my experience, most of the top athletes in school will leave soccer for the big 3 as a focus sport Football/Basketball/Baseball. If they are very good, those are much more likely to give scholarships as well. Soccer is much more popular with the middle to upper middle class suburbia kids, who might also be playing other sports, but are not treating it as a career. Maybe theyll play soccer in college, but their Major is still Finance.