On September 12, YouTube will be retiring the video response option due to lack of interest. According to the YouTube Creator Blog, video responses have a clickthrough rate of .0004% or 4 out of every million users.
The way I read that, it means that people who watch a video, aren’t interested in seeing another person’s video reply. That doesn’t surprise me at all. The whole concept was always a little wonky. When you create a video reply, the channel owner has to approve it before it shows up on the page so who knows how many of these videos were created and then rejected. If you’re disagreeing with me or trying to steal my spotlight, I’m not going to put that in front of my followers, am I?