I’ve said as much in other threads, but academic science is all but done in the US, it’s just such a huge bureaucracy that it hasn’t figured it out yet.
I doubt that 9/11 has much to do with it. Foreign students aren’t going into scientific graduate schools because promising Chinese and Indian students are likely to find better paying jobs within their own country than they will by going into science.
Let me explain the process of becoming a scientist (I graduated with my PhD from an ivy league school in the past year, to give you my cred to speak on the subject
). Generally one has to spend about 2-4 years after college doing research to garner enough experience to get into a decent school. Graduate school takes, on average, close to 8 years to complete (often considerably longer). You are being paid about 20K per year during this time. In other words, you are over 30 years old and living below minimum wage (remember, the best schools are in NYC, SF and Boston where cost of living is horrendous). Then, you get the big bucks, cause you’re a PhD, right?
Nope, you do a postdoc. This takes 3-4 years getting paid about 35K per year (limited, if any benefits). Then, you do another postdoc for 3-4 years. Then you quit science, because you realize that the tenure track professorship is never going to open up for you. Only 7-9% of postdocs ever get a tenure track position (and if they do, they are at the absolute earliest in the late 30s, but more likely mid-40s).
I can only tell you from my own experience, that the best graduate students are NOT going into academic science. They leave for industry (what I did), or get their MBA or go to medical school. I wish like hell that I could have stayed in basic science and done discovery for the sake of discovery, but I couldn’t afford to do it. And, frankly, the science that I’m doing at a company is so much more important than anything that I was doing at a university, that I can’t fathom why anyone would want to stay in academia.
An intelligent Chinese or Indian (the majority of the foreign grad student population) could certainly do better than this financially by going to business school, or frankly, staying in their own countries and going into telemarketing.
The difference between now and, say, 20 years ago is that graduate school used to take 5 years, and a postdoc was an optional additional year. Now, because there simply are no tenure track positions available, and graduate students/postdocs are cheap labor, universities continue to pump them out and keep them in a holding pattern until they finally give up. It’s terribly sad, but academic science is done in the US within twenty years.