To be perfectly honest, TM was a modest success, a sequel was announced not too long after, but we didn't exactly see a wave of Muppet stuff after that first movie. Maybe some promotion when it hit DVD, but that was about it. Even after a period of modest success, they were all too cautious with the characters for fear of overexposure (though every other franchise they own is pretty overexposed), and then had a huge burst right up for MMW. Maybe had they kept the momentum going after the first movie, there would have been more interest. I'd say having the interstitial and other taped things a year after the movie that wasn't as successful was more than they did for the movie that was.