don't worry about it too much. It's your right to decide what you want to happen to your stories, so if you want to lock the comm, that's fine with me (and most of your other readers, I gather). Anything that spares you some stress sounds like a good thing.
It doesn't sound like you have a requirement for 'obviously active journal', so I might get an IJ myself. I would miss your fics if I don't (I'm especially curious about what happens next in the Dragons Verse). You don't deserve all that extra hassle just because you were nice enough to share your writings online. So I hope this works out for you.