The notion that podcasting is dead is quite humorous. Brings to mind the "email is dead" articles.
My favorite Bill Burr webcasts are when it is just him. Yes, he jams in two big bunches of ads, but a few clicks is all it takes to skip them.
I think the point is that things change. TV channels change (usually getting worse). Podcasts change, usually by adding disruptive ads. The solution is always the same -- branch out, trying something new.
My
podcast, has no ads & no guests, runs about 75 minutes. I work on adding potential content all week. Editing takes three times as long because why should my listener suffer my hums and haws.