I suspect that many of your regular blog visitors don't know about RSS, readers, or subscriptions, and this is an easy way to spread the word about the advantages of reading by subscription.
Moreover, the appearance of this video is worth looking at. With paper, a whiteboard, and some markers, a boring, geeky subject like RSS comes alive. As hard as it is to imagine, some people find wine boring and geeky, too. I'd love to be pointing to a Wine in Plain English video like this.