Their contract with Podcast One was over. I know early on they had to give a large percentage of the show to Podcast One with that contract. Which is why they are now back to Darkness Radio and not Beyond the Darkness now.
I do agree that podcasting may be changing. What I'm seeing is shows grouping together to make their own networks. Works well for me as I can tune in like a radio station overnight and have programs of interest playing without having to connect to a new one as one ends.