Well, content is really only ONE aspect of the entire equation. You could literally write a Nobel winning peace of work with the most ground-breaking discovery but it could be lost in the ocean of information in the internet.
So sorry. One good article or even one excellent article on a blog will not improve your readership by much.
Just think about it. What do people read everyday?
Answer: Newspapers
Why do people read newspapers everyday? If you can pinpont the reasons why people read newspapers, it should give you a clue on what readers are looking for in a blog too. Okay, there might be some difference but the idea is generally the same.