I think they have been for years—a lot of my friends that used to use LJ constantly now rarely if ever post, but are on Facebook constantly. Many more of my friends that before a couple years back would've been talked into signing up use FB and a blogging platform instead, etc.

NB; I've no objection to the broadcast model, but it's the concentration on that over the disparate barely crossing over groups model that LJ has in UK/US that bothers me, both need development. I tend to act like a broadcast blog a lot, but my friends don't, and I'm there primarily for friends after all.