I’m of the mind that there is very little at Magic Kingdom that should be considered untouchable. Disneyland is the park where I think there’s numerous things that are untouchable and it would be beyond the pale for them to do so.
In Magic Kingdom to me, the only things that I view as untouchable would be the railroad, Haunted Mansion, Jungke Cruise, and Cinderella Castle. Those things represent either the best iteration of a certain attraction (at least in this country) or something that I think is integral to the parks identity.
I don’t think that the Rivets of America or Tom Sawyer Island is integral Magic Kingdom’s identity. I think it is to Disneyland’s and I would be very against them removing it there.
there are attractions at other parks at Walt Disney World that I consider to be untouchable because I consider them critical to that parks identity. But the other three parks don’t struggle with their identity as much as Magic Kingdom does. Magic Kingdom was built with an identity crisis.