Podcast pessimism?

Early on while reading Groundswell I was struck by how pessimistic the authors seemed to be toward podcasting.

Podcasters and even podcast listeners are rare, reaching only 11 percent of the online population in America and less in other countries.

As a University of Florida alum and an avid college sports fan, I was excited when I discovered during my senior year that a group of sportswriters for our student newspaper were starting a Gator sports podcast. I listen to it regularly and have grown more impressed over time as it went from an ambitious idea into a funny, informative and professional 40- to 60-minute product. If you're interested in seeing what a group of dedicated kids can do with a Macbook and a few pieces of recording equipment, you can check it out here:

alligatorSports Podcast on iTunes

But beyond that, I was just wondering if anyone else in this class is a frequent podcast listener. Are the podcast statistics from Groundswell out of date? Or are podcasts simply a technology that has failed to catch on?