The people , who are going abroad for study, are the people, who do not get admission into IIT/BITS/IIM's and other good Colleges. This abroad education industry is main revenue generation industry for Countries like Australia, UK and USA.
The quality of students in IITS and IIMs , is , not only due to the process and faculties in the institutions, but mainly because good quality of students who are getting in.
We need good raw-material and Process to produce good product. With massive infra-structutral facilities , the private colleges and universities wants become Like IITS and IIMs. But becoming IIT or IIM depends on input of students, which the private institution lacks so much. They all capitalizing on IT boom by giving Engineering degrees, but when you see the quality of students, it is pathetic.