Zuck doesn't get that some of us have multiple online identities: I see the biggest drop off rate in Facebook occurring in Teens who drop in and out of the service. My prediction is that there's a good chance that Facebook will go out of style in a big way with everyone under the age of 25. At that point it will slowly become a gray haired version of MySpace (or think AOL 2.0) unless Zuck can open up things a bit.
I love how the Facebook PR angle is that they have consulted with "child protection" experts who advised them that a real-name policy is a good idea. "Save the children" is a really lame excuse in this context.