I figured I'd give it a shot, so last summer I set myself the goal of writing one blog post each week, for at least a year. So far, I've never missed the deadline. The audience/reach of my blog, however, didn't change significantly, and it gets progressively harder to go on since it feels like I'm writing "to the void."
A lot of people talk about consistency, but I have come to realize that after a certain point, "marketing," (e.g. spreading your stuff) is even more important. I'd love to see a post talking about that.