I found this from R Miller: TAPE # 58 (March 1975)
Q: Should I discourage my son from going to Yeshiva University?
A: It depends. It depends where else he wants to go; what other places are under consideration. If he wants to go to a worse place, then don’t discourage him from going to Yeshiva University. But if he wants to go to the Mirrer Yeshiva then by all means you should discourage him from going to Yeshiva University