Other then new replacement stuff in the Muppets, I am at a loss to understand how it can be upgraded. The creator of this show is dead, it can never be replaced, it is still a good show (as might be assumed by the fact that you say you never miss it), and even the 3D after all these years is as clear and sharp as it was when they opened. To keep any part of the show would require redoing it with new puppets, new voices and everything but the show I go to see. Quite the opposite of your argument for "The Bakery", you are asking to throw out the one we all remember and replace it with what could easily end up, in my opinion, a shadow of it's former self.it just needs a refurb and it is back on top. its fun but the 3d is old tech that needs an upgrade and the show context needs to be freshned up. I never miss the show when I am there. I think when the muppet show airs on TV again that will be the catalyst for the new changes.
Now if you are just talking about digitalizing it and perhaps cleaning up the edges a little, then I agree.