See, there's that defense again. American history has not changed, how could it suddenly be stale? Other than the fact that apparently our society has reached a point where we can't possibly learn about where we came from without characters holding our hands and telling us jokes to help us get through it.
The point is that the tone of this show will not fit in Liberty Square. The area that this is going into is not meant to be an area that hosts a comedy show, be it educational or not.
This isn't like Wonders of Life, where the 80s/90s aesthetic was stale almost from the start. This is an accurate (granted abridged) recreation of an actual period of time that exists to reflect on actual things that actually happened. The story of our nation is incredibly compelling and shouldn't require a crutch like the Muppets to make it interesting. It's lazy.