There’s nothing to think more; the FSF should use YouTube or similar services as mirrors so people can watch the videos even when their website is hammered down by the HN crowd. You can hardly argue that the current situation where nobody can watch the video is a good idea.
It definitely should, but it doesn’t want to. That’s two different things. The goal of the FSF is to promote free software; that they don’t want to do it through proprietary mediums is obviously a legitimate choice, but that doesn’t make it intelligent.