We dont't have the next generation key servers yet. To add, update, or sign someone's key on a server is extremly unwanted unless she has given permission to do so. Old keys are purged. I never use keys unless they have a signature of a trusted friend. Therefore self-signing makes no sense to me.
Self signing a key is a waste of space and only encourages false confidence.
If you are a security 'hardliner' you are suspicious about any key. If a key falls through your web of trust, you reject it and never send encrypted messages to it's owner. Most PGP users around the world encrypt messages to unknown people once in a while. Mostly they use keys that they cannot verify. A self-signature at least is a proof that a user ID has not been tampered with.