For the record, I think a blog subforum, at least as I understand the concept, would be a terrible, horrible, no good, very bad idea. The whole point of the blog thread was that it was singular. I posted in it because it wasn't the "KvP's thoughts and feelings" thread. If I had to choose between making a thread about shit that happened to me and not posting it at all I'd choose not posting it at all, every time. And not just because of the new thread stigma (although that is a large thing that was easily avoided by posting in the monolithic thread I don't think forcing people into such an either/or position to beat that apprehension out of the forums will work at all.) but because, unlike an actual blog / journal / whatever, the blog thread didn't serve a simple declarative function.
The last posts I made in the blog thread before it was locked outlined a situation that I was in that I was not taking well, but I didn't post it just so that people would read it. I got several thoughtful responses and opinions, in the thread and in PM, that made me look at the situation in an entirely different light, and saved me a whole lot of anguish and energy. I don't doubt that there are people who would post just to post, and I'm guilty of throwing noise out just as much as anyone, but the thread provided useful engagement many, many times for many, many people. That the blog thread was singular meant that you were less self-conscious going into it, which, along with the bad things that entailed, made it easier for people to be honest, and made it easier for them to benefit from sharing.
I suspect most people are like me, and are averse to making small threads in which their concerns dominate the discussion. So people's concerns will go undisclosed. And for the stoics of the board that's fantastic, but for some people you either post on the internet or you internalize your shit, which is very bad for you, and those people ought to be allowed to decompress. I think whatever frustration that might cause is worth it. You know what you get when you enter the thread.
The splintering idea, of making a blog thread for your good days and your bad days, could turn out well, I've seen it work before, but you run the same risk you do splitting up the mediaf!re thread - the saddoes all get funneled into one thread, and the happy people congregate in another thread, and the benefits of both threads are diminished.