HI ending was kinda expected. CGP Grey seems to be a guy who is trying to minimize his personal public presence and the show was going from general internet culture discussions between two creators to Brady the Interviewing Genius trying to get Grey the Reclusive Weirdo to say something interesting. That dynamic is obviously not sustainable.

Compare that with Cortex where Gray can talk productivity systems and his unanswered love for Apple all day long. Endless content there, as you can never overthink it too much.