I can answer that question from my own experience. It's really hard to put hundreds of people, let alone thousands, into a live interactive streaming conference. This article doesn't seem to recognize that difficulty. "It's possible—in a course with scheduled lectures—for students to tune in, listen to a lecture in real time, ask questions, and participate in discussion from a remote location." Well yes, it's possible, but not in video. We've had interactive sessions in things like Big Blue Button or Google Hangouts, but you have to limit the number of participants. This means that the rest are relegated to tyoing comments in the chat. That's what Arc - touted in this article - also does. But even that can get out of hand if you have thousands of participants.
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