You make an excellent point. I used to read Joel Spolsky and Russinovich's blog quite often. I would actually pay to do this.

The main problem (and difference) I see with Blogs vs traditional journals is the editors. The majority of blogs from technologists, scientists and the like do not have an editor at hand. This reduces the writing quality of their articles.

Now may be a good time to setup a business connecting "editors" with writers.