I've been listening to the show in two directions: the weekly podcast and the archives in reverse. I'm at September 2009.
The show _has_ changed from 2005 to 2012. How on earth would it not have? There's no point in going on and on to bash this guy - I'll give him the benefit of the doubt and say he's a True Believer in the Value of His Own Opinion rather than a troll.
I will point out two things, though:
I will hear no charges of watered-downedness against the writer, creator and actor of Y'allbegone Pond, and.
The development of AP Mike as a Best Show (and beyond!) character since 2009 is so much more important than the fall-off of any one (or ten) regular callers that it should make your head spin. Who knew that the source of that insane off-mike cackling would become such a major entertainment force?