Earlier quoted context omitted.
The schools might have to let natives in; the horror. We might have to return to the dark ages of the 1950s when the STEM graduates were majority Americans and we actually were making technological progress in something other than lithography. "Science" is addicted to cheap foreign labor, which has ruined the market for natives.
Certainly increased acceptance rates for domestic students would impact which schools they go to. But do you have any data indicating that a) there are a significant number of domestic students who apply to STEM programs and get rejected from all of them and relatedly b) the demand for grad school positions is sufficiently elastic to match an 80% increase in supply? I'm not sure what your point was with the casual di…
Your first point is a red herring: the presence of cheap labor in the sciences and the lack of decent jobs makes it unattractive to any sane person who was born in a first world country.