The Rock 'n Rollercoaster reskin says so much about how the higher ups view their IP.
Muppet Vision, setting aside anything about being Henson's last work, gives times for a bunch of these characters to shine. You like Kermit, Piggy, Fozzie, Gonzo, Sam, Rizzo, Honeydew, Beaker, Scooter, Sweetums, or Bean? All of them get time to show their personalities and let you enjoy them. Some more than others, admittedly, but there's a whole twenty five minutes or so to share.
The characters are comedy characters, they're supposed to have time to talk and set up jokes.
A rollercoaster is not going to have that time. Especially not Rock 'n Rollercoaster, which we know has no show scenes. They need to try and cram whatever they can into the preshow, which, unless they alter it a lot, might be a couple minutes long. There's no time to work with. Even if the poster didn't already indicate a bunch of those characters aren't involved, even Henson would struggle with that.
But to the people making these decisions, none of that matters. They don't think you need time to enjoy the characters, they don't know why anyone enjoys them. They expect you to just see them and be happy, like a small child who claps when he sees Mickey on his blanket because he recognizes that.
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It is not a worthy replacement, at all, and it's a great example that they don't understand the stuff they own and are trying to make money off of.
That said, if you ask me, Muppets is going to the rollercoaster because a. People will ride any rollercoaster regardless of theme, and b. It lets them do it cheap without really retheming it, potentially with a dash of not needing to worry about conduct of the musicians depending on if they actually include real musicians. Not because they feel it's a good replacement or a good compromise or because they feel it'll be good in general.