Doug Kaye made the point that iTunes is going to start launching to 100,000,000 podcast listeners. Dave Winer is arguing that we shouldn't be interested in getting into the mainstream or hitting a large number of listeners, as if that would validate what we're doing.

To me, RSS, the net, the web... all this stuff is roads & rails. If you don't have enough roads and enough rails, you don't have enough traffic to drive business. You can't carry your content anywhere.

Popularity is a reflection of the extent of the infrastructure you've created. The bigger the infrastructure, the more stuff can happen.

It's roads and rails, baby. Let's build roads and rails.