Trust me the people who spent all their time focused on the GRE don't make it to decent grad programs.
The elephant in the room isn't why aren't more universities accepting 'local' students. No department would choose a foreigner over a local. You wanna know why? How much the student is going to cost them. Foreign students never qualify for in-state tuition (well at a state school anyways) and right off the bat are much more expensive to their advisor's budget. Local students can also apply for NSF Graduate Fellowship, and bring in their own funding, something most foreign students can't. Both of these factors make it so that the first preference is to hire local.
That said, in a large number of departments (especially in CS, and other sciences) you see a burgeoning international student population. Why? There just weren't enough decent local applicants to go around and science needs its foot-soldiers.
>That said, in a large number of departments (especially in CS, and other sciences) you see a burgeoning international student population. Why? There just weren't enough decent local applicants to go around and science needs its foot-soldiers.
That's not really true. The basic problem is that while a foreigner can take a US PhD and apply for a fairly prestigious job in their home country, an American with a US PhD gets their career stuck in a rut. Multiple post-docs, for low salaries and long hours, followed by a desperate rush to find a job in a national lab, an industrial lab, or academia. There are hundreds of applicants for each permanent job, and even if you get a permanent job, you're not really guaranteed job-security (tenure). Many "permanent" jobs are even on soft money, which means if you fail to bring in enough grants (and grant rates have fallen dreadfully low in recent years due to Congressional budget cuts), you're a "professor" who can't pay for food or housing.
American academia relies too much on having legions of cheap grad-students to do much of the footwork, and then throwing those "students" out of science entirely when they graduate. It also relies on Congress actually funding the NSF, NIH, NASA, etc. at rates proportional to how much science is being done, which of course nowadays Congress steadfastly refuses to do.
American science careers are in crisis because the career model has become based upon exploitation: getting as much cheap labor out of as many people as possible before throwing them away.
The elephant in the room isn't why aren't more universities accepting 'local' students. No department would choose a foreigner over a local. You wanna know why? How much the student is going to cost them. Foreign students never qualify for in-state tuition (well at a state school anyways) and right off the bat are much more expensive to their advisor's budget. Local students can also apply for NSF Graduate Fellowship, and bring in their own funding, something most foreign students can't. Both of these factors make it so that the first preference is to hire local.
That said, in a large number of departments (especially in CS, and other sciences) you see a burgeoning international student population. Why? There just weren't enough decent local applicants to go around and science needs its foot-soldiers.