The Muppets rumor had me worried at first, but this sounds good!
To most people, the Hall of Presidents is boring. That is all but a fact. No matter how much you love the HoP, your fellow park guests do not have the same appreciation for it. Unless they appreciate being able to take a nap. With Universe of Energy soon shutting its doors, nap locations will become increasingly valuable!
Strip away the classic and nostaglic value and I think it's a pretty terrible attraction. The average history youtube video is both more entertaining and more informative. I'm a fan of the original EPCOT Center, but the HoP cannot be referred to as "edutainment" because the entertainment half is seriously lacking.
I mention HoP for comparison, because in my opinion, this Muppets show is a far better way to teach history in a theme park. Unlike the Hall of Presidents, this will achieve a far better ratio of "edutainment" by educating in a fun and vibrant way. I'd have an issue if they were adding a Muppets show that had no relevance to the area, for the sake of having a Muppets show. But that is clearly not the case here.
Best of all, nothing is leaving to make way for this. It is an addition. A little street show. The HoP stays for certain folks, while this show will appeal to your average crowd. There's really nothing to complain about. I'm sorry if it ruins the atmosphere for you. Sure, there weren't Muppets in 1787. Nor were there strollers. Nor were there tourists wearing T-shirts and mouse ears.
I bet this will spark more interest in history than anything in Liberty Square ever has. This is a definite plus in my book.