Had to finally put in my two cents on "case closed" as a long time listener.. I guess first and foremost, I believe the podcast to be one of the only places left where an artist can run free and do as they please. While I appreciate Matt taking the opinions of listeners into consideration, he should probably continue doing whatever he thinks is best for his show.
However, I just don't think people on the other end of the line are prepared enough for it to be a good segment. Either the person comes off as reasonable (because the audience hasn't always read the person's tweets and whatnot) and Matt seems overbearing, or the segment just comes off as boring. I think it can work if i4h talks to the people first to make sure they are able to make the segment interesting.
Who knows, I may end up liking it. At first I was so annoyed by Eric the (un)paid intern, but then I realized I was just jealous that he got to be the i4h intern and I started to like that segment.
Improv4humans will remain one of the best podcasts out there with or without "case closed".