Huh? Plenty of people have been discussing the premise of the video. Particularly because many of the points raised by Zepla are, in fact, concerns that they themselves have put forward around these parts for some time now.

Just because they choose not to engage with specific posters that doesn't mean they're ignoring the premise of the thread. Nobody is owed a reply to anything that they choose to post and it could very well be that some individuals have opted to make use of the ignore function. Or the thread is simply moving too quickly for them to do anything but light discussion.