"logged-in only" editing

I'm actually kind of opposed to this in principle, but mostly because the community has always had the conventional wisdom that IP editing = openness. But that interview gave me a new perspective. What if IP editing is generating more heat than light, and causing the community to close up? What if asking people to log-in first will actually make it easier for them to join the community? What if log-ins are good for openness?

Again, 20 Wikis on Wikia do it this way, and it supposedly leads to better content AND better community. There are no ghosts floating in vapor. People are people, and interaction becomes more human.

I wouldn't recommend just jumping in. But I'm very curious to get some data. A trial is exactly what we need, if we could figure out a good place to try first.