I am not sure how difficult it would be to implement but it would be nice if there was a button on a video's page in order to follow comments on the video.  Maybe something like the bell for our notifications or a subscribe button.  I like to read the comments on videos and it would be nice if there was a way that when comments are made on a video that I enjoyed that I could get an alert and I could go see what has been written.  

I also think that this could make for more member discussion on a video as oppose to the comment section becoming a Q&A with the video creator. The comment section almost always becomes a Q&A with the author by virtue of having no notifications for members who have seen the video (we only get notification for our comments in the video).  A member would have to log into each video and see what new comments are made, and that is not likely going to happen.