Most people who aren't blogging right now don't for one or more of the following reasons:
1) they are afraid of the technology
2) they don't have anything to say
3) they have something to say, but are afraid of their words being published forever
When you publish online, it is more likely than not that time will reveal your meandering thoughts of yesteryear to at best wrong, and at worst negligently ignorant. It strikes me that publishing items online requires either great ignorance of the strange permanence of our words, or a great fortitude to make statements that may later be proven wrong or stupid.