Putting The Muppets in Liberty Square is a terrible idea. Period.
As conceieved and executed, Liberty Square, like Main Street and Frontierland, is meant to showcase a time in history and offer experiences that tie into the modern conceptions of what themes and locations resonate with that time period. Liberty Square is about early American history, and originally all buildings, shops and restaurants offered samples of life in those days, within the framework of a clean, family friendly enviroment. A silversmith, a tavern, shipyard, colonial mansion, Liberty Tree, tricorn hat shop, fife and drum corps and a government structure based on Independence Hall with the date of the constitution on it. It's no accident that The Hall of Presidents is located in the centre of the land. Though it features moments in history beyond the 1790s, the underlining themes (The Consitution, democarcy etc) are rooted in the values planted in the same time as those Liberty Trees. [If you're wondering how The Haunted Mansion fits into all of this, I suggest
this article written on the subject].
A character like Sam the Eagle (let alone the rest of The Muppets), has nothing to do with any of these themes. His "patriotism" is largely played for laughs, and his existance has nothing to do with the values or time period of Liberty Square, even from a modern interpretation like Johnny Tremain. If built, the attraction/show may be cute in its own right, but it would represent another failure on the part of Disney's current corporate and creative culture to respect the groundwork that was laid for them but their predecessors. I'm not saying nothing in Liberty Square should ever change, but there are better options for the land than the work of Jim Henson.
This is the kind of "creative" thinking that gets put out on twitter by fans who have no background in design or knowledge of the company's history. Now people are paid an annual salary and are actively encouraged by upper management to think up these concepts because the underlining goal of Walt Synergy World is pushing brands, and not creating quality themed experiences that can stand on their own merit or support established design principles. Once again, Disney is imitating its competitor by beliving that theme parks are where people go to "ride the movies".
If you love this idea and think its cool, it's because you are a Disney movie fan or Muppet fan first and of theme parks second or third. It's a shame that The Magic Kingdom, a park so carefully mapped out from both a physical and conceptual standpoint continues to be chipped away by a lack of originality rooted in shameless self promotion.
[/rant]