This has been in the idea pipeline for a while, but the arXiv is slow-moving. (They probably wouldn't host the actual video files for cost reasons, but that's not a big deal.)
http://blog.jessriedel.com/2015/09/02/additional-material-on...
This seemed a major omission of the OP.
The distillation quality hierarchy goes something like 'conversation among best-in-field researchers', 'conversation with principals' and 'research talk by principals, plus subsequent questions/conversations', 'review paper', 'journal commentary' and 'papers' but... in many fields, papers really need some of the above to provide critical context.
So a distillation system exists - it's just very very narrowly scoped. It's sad to see graduate students and young faculty who haven't "plugged-in", and so are not spending their time well.
And it's depressing to see a 'conversation among best-in-field researchers' excoriating a perspective on a topic, knowing that broken perspective is how the topic is pervasively taught, graduate down to high-school, and it's not going to change any year soon. There being few incentives or mechanism to pipeline such insight into educational content.
So yes, starting to build an expectation that talks become available as video, and are easily found, could be a non-trial step forward.
This is a big part of how I don't understand why some type of annotation standard hasn't taken off for research papers. Everyone does the same duplicative, time-consuming work of turning a paper into knowledge in their own head, so many wheels are reinvented. Where is the GitHub for research ideas?