I'm very unlikely to leave LiveJournal. I have a permanent paid account with all the bells and whistles. I am established here with lots of people on the FLists. I've got my Beta-reading journal here.
Obviously if LJ completely crashes and burns, yeah, I'll have to find somewhere else. While I have a DreamWidth account, I'm unlikely to make that my default. It's there in case everything else goes, I guess.