“By adding video, we are asking the person to let us see them, and we are requiring more of their attention. No longer can they drive and chat with us if they have to look at a video. No longer can they talk in the bathroom or at other times when they are doing their personal business. No longer can they discretely interact with you while simultaneously talking to another person, reading a magazine, or otherwise only paying half attention to you. Adding video to the situation completely changes the social dynamic, usually in a way that makes us not want to do it.”
Really think, how many times are you really only doing one thing while on the phone? Same thing why radio is still so popular. We can’t focus on just one thing.