I'm not sure I actually read about any biggest mistake, apart from maybe not being united, in the immensely parochial piece. But I can't disagree with this:

Podcasting didn’t start in control of the monied few and gradually become democratized. Podcasting started as a democracy, and now faces the incursion of the monied few.

And while I don't mind about the monied few taking over (well, not too much) I do mind that they are even called podcasts. They really are radio on demand, and we storied few shouldn't be judged by the same standards.