Well Kermit will probably never appear on the show again ever. He barely was on when Kermit was with JHC and Sesame Street was sold to Sesame Workshop. Now that Disney owns Kermit I doubt he will ever visit the street again. I do know that he was on a couple of times after Jim Henson died, but not nearly as much as before. A lot of his appearances on the show came from archive footage.