The piece from Camworld, linked above, shows some vision toward what blogs could, and ultimately did, become:
Every industry in the world has a potential need for a quality weblog or two. It's safe to say that the Macintosh community has been inundated with Mac-centric news sites for several years now. So many, that I've lost count. But what about a weblog for the homemaker? Or the thousands of hot rod enhusiasts? Or the ham radio hobbyists? These are called niche market portals, and every one of them (and thousands of other niche markets) could be a potential source of quality information for someone.
Sure, there are still amateurish blogs, but no longer does the fact that anyone can start one of these things automatically close readers' minds to the possibility that a blog writer could be an authority on his subject matter.
Today, I religiously follow a blog by a Madison Avenue copywriter, a waiter, a nightclub bouncer, and an activist citizen of my town. Each, in his own way, is an expert in his field.
I think that's the asset that this form of written expression has become. More than giving voice to people with something to say, the massive network of blogs has become an information and experience resource on just about any subject, frequently more expert and in-depth than professional journalistic coverage of that subject would ever be.
And it's all a click away.