Cool, thanks for the feedback! I think that more interviews would indeed spice things up. I will keep an eye out for interesting interviewees.
Re. the rest of the channel, I had considered whether that might be an issue, and I understand why it certainly could be. My aim in creating the channel was to be a bit holistic and cover whatever came up that was interesting to discuss. While I don't want to change that aim, I wonder if there's another solution, i.e. perhaps a second channel that only dealt with dash specific issues related to the proposal, or Dash in general. I could move the Dash content there, and let viewers of the main channel know it's there to check out.
I also agree that short and sweet is the key for most videos.
Thanks again for taking the time to provide your thoughts!