Should there be one centralized RSS Directory?

Dave Winer raised the idea that it might be a better user experience to have one centralized means to get RSS feeds–rather than dozens of service icons–and now folks are talking about it.
My own thought is that while having an easy means to get new users subscribing to feeds is needed, narrowing content choices into one directory won’t fly–just like search engines and directories, RSS readers come in their own flavors and styles.