Blogs Not Doubling Every 6 Months?

I came across an excellent post by Kevin Burton about his analysis that blogs are not doubling every 6 months and there aren't really 50 million active blogs while I was reading Ethan Stock's blog. This runs contrary to the State of the Blogosphere that Dave Sifry puts out.

While the post that Kevin put up is terrific, I think that the comments are most interesting.

What counts as an active blog? I would consider this blog semi-active and I'm posting about once a week or once every two weeks. Should I count? What are the categories of posting rates?

There are probably two true statements that come out of this:
1. Blogging is certainly heading into the mainsteam and becoming increasingly important
2. Blogging is being overhyped.