This is an interesting suggestion. I'm curious what you mean by "sending grad students to top universities":
1.) the target universities have to accept the students, right?
2.) This implies some top-level RTS-game-esque control of the grad students when, in reality, they're making independent choices (albeit influenced by many factors, including govt promotion)
3.) Seems like the rational decision for ambitious grad students is to apply to said top universities (which may just happen to be abroad).
Same for "bringing many of them back": I read it at first like it was akin to some sort of spy agent network when in reality "bringing back" probably means various incentives, not some forced thing. Carrot, instead of stick.
1) target universities have to accept the students
Yes! Which the US incentivizes by a) underfunding K-12 education, reducing the internal applicant pool, b) competing grants in a way that incentivizes PIs to grasp for cheap labor. Additionally, the individual states also incentivize this. Look at the UC's own statistics: since 2009 the highest chance of acceptance goes to foreign, ethnically Asian applicants. https://news.ycombinator.com/item?id=20321493
2) RTS-game-esque control of the grad students
Yes! Having been in the room when one of those grad students got a very stressful call from home (like broke down crying multiple times), it's definitely not all carrots. And the removal of carrots eventually looks like a stick.
3) Seems like the rational decision for ambitious grad students
Same for "bringing many of them back": I read it at first like it was akin to some sort of spy agent network when in reality "bringing back" probably means various incentives, not some forced thing. Carrot, instead of stick.