The muppets tend to work best in shorter segments. Look at how great some of the advertisements are for both the past two films, not as items to sell the film, but just as standalone products themselves. Or the various youtube videos that have gone viral (Bohemian Rhapsody, anyone?)
Disney should probably refocus to just producing that sort of product. They could do another sketch show (which provides a nice showcase for shorter pieces), but it would be even better to just make the short pieces they can put out there online as well as slot in at various points on their channels, perhaps with the occasional TV special.