Brain drain slowdown

It used to be the case that almost all world class researchers in Asia were trained in the US, Europe or Japan. Lately I've begun to meet scientists whose PhDs were earned in China, Korea and Taiwan who are nonetheless at the cutting edge of research. It is becoming more common for the some of the most talented students to stay at home at leading institutions such as Tsinghua (Beijing) or Seoul National University or Taiwan National University (Taipei). Looking at undergraduate degrees, China already produces vastly more engineers than the US - some estimates say three times as many per year.