I haven't read the whole thread but suffice to say that this show was a mess and the retool, despite what people may think, was more like an audition for a second season to the network than a legitimate hail mary. Who tosses a show three extra episodes and says, "Okay turn it around and make it a ratings hit in five weeks with little to no promotion or you're done." That's just not good business sense.
Now, did the audition go well? Despite the cancellation, I think it went okay. Critics were slowly coming around, and there was some workable here. Something that could flourish, that could maybe with a second season become a modest-sized, cult hit. Like an ABC version of "Bob's Burgers". Not great ratings, but reliable and with a fanbase. It sells merch, and that should be good enough. Plus the franchise is an asset to Disney, just like Marvel, Pixar, Lucasfilm, etc. The execs wanted to see if they could make it work to justify keeping it (and the Muppets in general) on the air.
And then the floor dropped, the earnings came in, media crashes and burns and the stock plummets. I've heard it was very last-minute with Muppets. It and Castle were the two series on the bubble at ABC, waiting for a last-minute decision. So the Muppets, in the end got off'd before an S2 entirely due to things that weren't its fault. That's showbiz!
I don't think it would have lasted much longer than a second season anyways, but that's just me. In general there were things I liked about the show (Uncle Deadly, the penguin, Rizzo, Gonzo, Scooter) and then a lot I didn't like (Sam/Janice, Denise, Fozzie, Pache, the guest stars, the horrible sketches), yet the biggest problem I had with the entire thing was the mockumentary style. It fit the Muppets like a pair of extremely tight pants: no room to breathe, to experiment.
Let's revisit how the Muppets regained their popularity: in the late 00s, several videos were uploaded to YouTube of the characters just doing silly stuff, making music videos and in general just being experimental Muppet wackiness. Disney was just letting them do their thing because what else to do with a property you recently paid a buttload of money for? It caught on due to the nostalgias and suddenly things started getting running.
So it baffles me that in the face of the disappointment of MMW they choose to try and restrict the characters. Granted, it's a pointed move to run away from the family film and go adult, presumably straight for the "nostalgias". But the "nostalgias" are based on innocence and happiness. Really not a great idea to have your first few episodes feature Kermit as a persnickety jerk and Miss Piggy bragging about having relations with Josh Groban complete with innuendos galore. This isn't subtle stuff that is meant to fly over kids' heads, this comes out of the TV, bashes their head in until he turns to his parents and suddenly wants to have the talk.
Even worse is the fact that they're boring, since they're restrictive. There were attempts to up the zany as it went along, but it feels like in the first few episodes they were trying to play up "hey the characters you grew up with now have jobs and tedious personal lives! No singing, no dancing, no silliness! They've GROWN UP!" You know who that would work for? People who generally don't like the Muppets... because that's not what the Muppets is or who they are.
And the audience gave them a chance, and Disney pulled out the stops. The night of the premiere I arrived in Walt Disney World at about 4PM, where after going to my hotel, I went to Downtown Disney/Disney Springs, and returned back to my room at 8PM. Aside from the insanity that was Twitter and Facebook, I had seen at least a dozen ads for the show in those four hours alone. The next day I went to Disney's Hollywood Studios. Again: overflowing. They did their part, you guys did yours, the creatives tried to do their's through all the struggles... but in the end there's no one person to blame. I want to say whoever the exec who made the decision, "Okay and let's put this on network TV rather than cable or streaming where it probably could survive better"... but who knows if one person made that decision. ABC's hand was forced, and now we have a sacrifice.
The loaded question after this is, of course, what happens next? Why even bother to speculate... your guess is as good as mine.