I talked to someone at the archive. He said a few people are aware of this, including people involved with the way back machine. It might be hard for them because video content in general doesn't save well, especially if it's hosted on YouTube. I tried out some video streaming, audio streaming, and download links on previous snapshots of the site, and they all lead to error pages.

Better yet, crowdsource subtitles from hearing people who find the videos useful.

The archiveteam is trying to preserve the content: http://www.archiveteam.org/index.php?title=UC_Berkeley_Cours...

I think the videos are still available to students. I'm sure someone will upload a torrent soon.

archive.org will have to be careful - they're going to be under the same obligation to provide captions as Cal.

edit: If Netflix can be sued and forced to provide captions, so can any other entity providing uncaptioned video.