This is very evident in the U.S., but even more significant in the U.K., where independent films have replaced studio films almost entirely. With camera equipment getting less expensive and home editing systems readily available, some people are skipping film school entirely. Anyone can make a movie, but there's a big difference between those who know what they're doing and those who don't. For that, they still must be taught. He also comments on the importance of receiving feedback.
Schools have experts to evaluate and analyze.
For those who are self-taught, the audience becomes the teacher. Film school is a way to totally focus on your point of view. When competing with other students, you want to understand lingo and protocol. You're paying the experts to teach you what you need to know. Several, including HFI, are now offering an online program.