First, the average height of Americans is now lower because there are so many Hispanics living and being born in this country. So I suspect Chinese and Americans will average about the same height in a few years. Of course there will always be enormouly tall ball players – from many cultures.
Second addendum, since our national economic miseries started many more Chinese students are studying in the states as colleges need students. Some institutions even have marketing efforts in China to get well-off graduates here for advanced work particularly. After all – why not. China is handling our debt.