Probably won't be immediate. I've wiped out a couple of old comms and my existing LJ entries will be on Dreamwidth, as will anything else that would once have been crossposted to LJ. I've got to go through all my posts and see if there's anything actually still hosted here (pictures, docs, etc.) but from there I'm going to go through and actually delete older stuff.
It's a shame. But we all knew it was heading in this direction.