I agree that this whole thing could end up being good for people stuck in the current system. Personally, US immigration path has become so much less reasonable comparing to Canada's. Hostility is the word I'd describe the system in US.
On another topic, the American PhD's quote doesn't make sense without context. Why "mediocre" scientists are the issue for scientific "competition"? The proportion of top people is always low, scientist or not. It's the system's fault that the whole scientific process becomes a "competition" in my opinion.