I'm yet to look at it properly, but I'd call it a big mistake if this is not built on top of OpenID - to me that is the natural extension of the concept.

Imagine signing into a site with your OpenID and actions being sent back to your hosted DSNP profile Facebook Connect style.

I'd like for DNSP implementations (which allow users to lay claim to a URI) to support OpenID in the sense that it is a provider of identities. It can't be a consumer though, since an OpenID identity cannot (necessarily) talk DSNP.