Countries like India, Vietnam, and South Korea have begun replicating the Chinese Thousand Talents program to attract their diasporas back to domestic academia.
Significant domains of CS such as HPC/Systems, Networking, OS internals, etc are heavily dependent on faculty, graduate students, and post-docs who are all on some sort of visa. And increasingly, at least amongst Indians, becuase the backlogs for US citizenship are insane, a number of those people have been taking sweetheart positions at INIs like the new IITs with almost US$100k in public-private lab startup grants on top of a $20k salary (tax free due to the income tax changes) with free housing and car and complete autonomy to consult with private sector players without IP entanglement (one of the biggest headaches for public private STEM R&D partnerships in the US).
Vietnam is doing something similar as well to attract Vietnamese diaspora in SK and Japan, along with Viet Kieu in America and Australia.
A nativist academic culture in STEM in the US would completely destroy any R&D capacity that even exists today.