I think we are near peak corporate podcast. I listen to radio in the morning and I hear a lot of commercials for "advertorial" podcasts by lyft (or is it uber? I don't pay attention) and something hosted by Ariana Huffington with some mattress sponsor. And I can't imagine that a lot of these celebrity podcasts will last more than a year or two.

However, I think the non-corporate podcasts will be around for a long time.