When a profession is protected by academic freedom and tenure, it tends to turn inward. To a large extent that's good.
You have to pay so much to see theater, even in Chicago. In the Greek theater, you didn't have to pay anything. You actually had to go, and you just sat there all day.
Radio was, in a way, a very philosophical medium. You could make an argument on the radio, and people listened to it. Television is already harder because people's attention span becomes shorter with television. Cut to a commercial and all that.