You can only immigrate a finite number of people. People in those countries also are below replacement like India which is unprecedented. This is nothing to say of the social backlash mass immigration seems to be having across many countries.

>You can only immigrate a finite number of people.

The same like with any imports. Market responds to demand. China has 50M university students, US - 20M. That means that upon achieving US percentage (in probably 5-10 years) China can be having 80M students - sufficient enough to have some of that satisfy US demand for college graduates.

> People in those countries also are below replacement like India which is unprecedented.

Quick google shows that population growth in India is considered a problem, and so they actively trying to decrease birth rate.

>This is nothing to say of the social backlash mass immigration seems to be having across many countries.

Any technological (and mass migration is a result of technological progress) shifts and its consequences cause social stress. Successful societies adapt.