Perhaps. But I think the blame would go to Washington DC rather than the employers.
For this in particular:
> why would you get another job at that company with significantly worse contract terms?
Even if it is worse on paper (and it won't even be worse if the big tech companies do struggle to retain talent), it is likely to still be better than local companies offer.
If you just got massively screwed over by them (having upended your entire life in hope of getting a better future, then having that rugpulled), why would you get another job at that company with significantly worse contract terms?
Considering the rest of the world is reacting to the US setting itself on fire by finally stimulating local tech, why not just join one of the local alternatives instead?