The US makes up about 4.5% of the global population and it seems silly to think that the FAANG companies and the new AI startups chasing behind them are going to restrict their hiring to this tiny slice of the global talent pool.
The only effect this is going to have is accelerating the offshoring of jobs through more hiring in India, Europe and Canada, which is a net loss for the US.
I myself became a US citizen two years ago after being on a H1B. I was paid the same as all my peers and for all its shortcomings the program worked for me. It stunning to think this has been closed off, killing the main path for skilled immigration into the US.