But I wouldn't mind at all if Pizza Planet got shuffled over near the Pixar area if it meant a second Muppet attraction.
Make this happen!
Muppet 4D must be removed. It never worked as an attraction.
You're right, the Muppets are more Universal-like in their irreverence than Disney. But they provide Disney's Imagineers (some of which have some Universal Creative experience, by the way), with a safer opportunity to try something wickedly sarcastic without going off the rails and ticking off the fan base the way the awful Tiki Room Under New Management did.
I'd love to see a "Muppets room", with Muppets lining the walls and ceiling like the Tiki Room, subjecting the audience to 10 minutes of absolutely gleeful chaos. Best case scenario? Give the attraction some "Laugh Floor"-like capabilities to tailor the schtick to the specific audience, or at least to keep the jokes fresh and timely. Muppets never must be allowed to grow stale.