First, you should notice that StackExchange has discontinued all blogs and will no longer be hosting Blog Overflow. The biggest problem was that most blogs, our blog included, were not active.
The reason for that is most likely that people are busy. I barely make it to 4 blog-posts per year on my own site; not because I couldn't think of interesting topics, but because there are so many other things to do. Additionally, a good part of the people who commented on this original idea are no longer active (or as active as they were). This includes rm, Leonid, Mr.Wizard, Istvan, Heike, Verbeia, and Rojo.
Many of us have their own blog but as Kuba commented, it is worth mentioning that C.E. has set up