Unfortunately, the home they return to is not an ethnocentric utopia like Japan/Korea. It's an ethnocentric, smog/corruption ridden dystopia that just so happens to now be the world's economic superpower.
With America's global standing in the crapper thanks to decades of anti-immigration fearmongering policies lead by the GOP, it'll be interesting to see for how much longer it can stand as the de-facto place for global STEM talent.