WP community members that can shift - those are wordpress.com members, right? They can't jump around standalone WP sites and Dolphin is all about independent sites. We tried to build a p2p "connector" - webhome.org, but can't really commit much time to the project.

Also, even now, we can't really step-down to "simplicity" of WP organisation. It's OK for blogs, but not for a full-fledged CMS. I see your point though, and trust me - it's exactly what we're doing now - getting see more rid of noise.