Why do many universities continue to build lecture halls? Because lecturing students is the way to extract the most money with the least investment of staff time. Many institutions are about credentials not competence. Buildings and professors are separate budgets and the priority isn't learning, it's maintaining the cash flow.
By the way, I haven't listened to this podcast yet, but I've spent way too much time (and money) in lecture halls.
The College Lecture? Nobel Laureate Gives it a Failing Grade
