Why would they do that? UCB is a public insitution, with a mandate to serve the public. They're not a torrent site trying to skirt the law.
While there are discussions to be had about how to move forward; I would hope the end result would be continuing to offer the free courses, while solving the accessibility problems, perhaps with the help of the communities they serve. I would be happy to contribute transcription and captioning to the courses that I take online; I transcribe and caption all of my videos on YouTube, religiously. It's not that big of a time cost, and I take notes when I'm taking a class, anyway.
I hope this will be viewed as an opportunity to (not necessarily in this order):
1. Improve accessibility tooling for these courses, particularly captioning videos.
2. Improve awareness of accessibility guidelines for websites and online materials.
3. Make all of these fantastic learning resources available to people with disabilities.