Exactly where that point is, seems to be a function of how many highly educated people a country can produce vs. how many jobs it can create. 100K new doctors and engineers, with 100K new jobs for them? Wonderful! But what if you only had 20K new jobs? Now you're in trouble.
Instead of treating this as a first world problem, developing countries should employ their brightest minds right now to research why this is happening in the U.S. and find a way to avoid getting stuck in the same place 20-30 years from now.
I'm skeptical, given that the population-wide baseline of knowledge in the USA isn't actually that high. When the subject comes up, we hear that other countries teach their high-school kids calculus, linear algebra, and real physics.
Here in Colombia is well know this say:
Go to the university, drive a taxi.
Also:
Why go to university? The diploma.