I don't see why a Muppet Spinoff focusing on various characters wouldn't work, but you can just see the comments of "why isn't [such and such] in the show? Fail."
I, too, want to see a project move away from the Kermit/Piggy type story. Anything that can be said about Muppets From Space, it was nice to have a movie about another Muppet character besides Kermit. Let's face it, every movie aside from that and the human focused story adaption ones was about Kermit. There's so much potential for a movie/special/DTV project/TV Show (at the least likely) about another character, or group of characters. And I think it's darn well time they did more with the Electric Mayhem, especially since most of them have finally been recast. TV show, movie, DTV project...whatever. I want to see more EM focused stuff.