I don't understand this argument? All indications are that the Muppets attraction at DHS is going to stay, and also there is a chance that Pizza Planet is going to be rethemed to Muppets. If the second point actually occurs, this is a pretty good indication that Disney thinks keeping the Muppets at the park is a good idea. Where does the TV show come into play here?
People believe that if the show tanks, public interest in the Muppet will waver, and Disney, always trying to pick up with whatever keeps the masses happy, will close it.