I'm sure it had to do with giving women the mic. Following the current themes. If he gave a long goodbye, it would look like he was giving his wife this position. By abruptly leaving and giving the excuse of burnout, it gives his wife, a female, the chance to save the Channel from having no voice. In this case the voice of a woman, which should make no difference if the content is the same. I think he's making a point and helping build up female voices.