I was thinking that while abandoned neighborhoods are one way to think about the mass of LiveJournals not being updated anymore, the journals are by their nature really well-preserved. They're only abandoned in the sense that they're not being updated anymore, but all the past stuff is still there... kind of frozen in time.
Ah, I see.. That makes much more sense. Yes, it is an interesting phenomenon. Some of the abandoned journals are people I once knew and cared about. Some of them were kept by people I'm still in touch with otherwise. Kinda odd.