As a long-time podcast listener, I have been steadily reducing my intake of podcasts in recent months. For me, this is largely due to a few annoying trends, such as Podcast A airing an episode of Podcast B, a new offering from the same organization. These crossovers are becoming common, and they are basically very long ads. I am seldom interested, but it's difficult to get them out of the play queue, especially while driving.
As a long-time independent podcast creator, it feels as though the field is becoming saturated, making it nearly impossible for a podcast to stand out without the backing of a major podcast network. It is reminiscent of the tipping point of blogs, where the quirky ecosystem of offerings mostly congealed. That change was good for advertisers and a few big content companies, but detrimental to the diversity of content.