Comedy Central is strictly adult programming. When Futurama was moved to the network, the execs immediately wanted more raunchy material. It wouldn't be a good fit. Disney still wants Muppets to be a family franchise, and the only true balance would be found on a cable network such as ABC Family. Without adult humor, sadly, there's no way that it can be convinced it can be viable to feed on a strict diet of 18-34 demos. It's really strange, but that's just how TV executives think.