No, I'm not leaving use.perl, but it seems there are quite a few people who have done. The only thing I want to say about this is don't expect me to read your journal if you leave.
Now the flip side of this is what is doing these journals all about? Mostly it's a purging - people like to pour their hearts out. Or talk about some geeky development thing they're doing. It's not necessarily about people reading what you've written. In fact on issue for me is a record of things I've accomplished over the year.
But the big part of it for me (and why I come back here every day) is the feedback/replies. If you leave, you lose that. At least from me. I don't expect I'm important enough to anyone that this may bother you, but I may not be the only person who won't read your ramblings any more.