"(I guess that could still be reproduced by videochat or something...)"
Even if it is delivered as videochat, the attention of the instructor is still a limited resource. And this is the value proposition of a 21st century university. I think this change to the MIT lecture format reflects an understanding of this. Now that MIT has made much of its content available as Podcasts, etc., they are looking for ways they can provide more value to the people on campus.
Absolutely, and that is great for students. It could be that universities will become more relevant in a digital age. In the past, a student sitting in a gigantic lecture hall didn't have too much advantage over one just reading a book (and not paying tuition). If universities move to giving student 1 on 1 (or N on 1) interaction, someone in a university will have a big advantage over someone outside.
Even if it is delivered as videochat, the attention of the instructor is still a limited resource. And this is the value proposition of a 21st century university. I think this change to the MIT lecture format reflects an understanding of this. Now that MIT has made much of its content available as Podcasts, etc., they are looking for ways they can provide more value to the people on campus.