I don't think you can move the extremes without moving the mean. We are already seeing the effects. First and second generation immigrants from foreign countrie

I don't think you can move the extremes without moving the mean. We are already seeing the effects. First and second generation immigrants from foreign countries (like China) outperform Americans. This cycle could become self fulfilling. People expect immigrants to achieve at the extremes and prioritize other things in their lives. As you said, let's suppose having parents who go to these schools predict who will enter. At this point, recent immigrant families would outperform and others under perform and this can continue as cultural values are passed on. Is this is a sustainable situation? No, I think it bifurcates it and creates permanent classes. On the other hand, more focus on STEM education broadly would translate to higher enrollments and self reliance. This also assumes that out performing immigrant families assimilate. Non-assimilation would exacerbate the bifurcation.