I'm not criticizing Elon, or Colbert. Just that late show interviews always talk about Tony Stark, that he wants to colonize Mars, that he's the CEO of Tesla and SpaceX, etc. There's never any really interesting questions in there that probe much beyond that.
My point is that the man is truly interesting, yet the questions are always the same. At this point Elon's a bit of a celebrity and lots of people know him (look at the autographs he signed after the show, for instance). Would be nice to hear something more.