Which makes up, what, 5% of the experience for Spaceship Earth and World of Motion? Those scenes are originally designed to be fantastical and vague, easily updatable by a company that definitely would have continued to update them until Eisner came in. That's not to dismiss how poorly the company was run overall by the old guard, but I still think that there's a balance that allows you to spend loads of money while still being insanely profitable as the OLC has exemplified.
You keep hanging these problems on Eisner - the problem was not Eisner - The problem was the changes in society and the world outside Disney moving faster and faster while Disney's established model for major attraction lifecycles was dying and was not fading as commercially viable way to operate.
Take CoP for example. It aged w/o updates at Disneyland too... not because of Eisner.. and it got updated when? Yeah, when a new sponsorship contract was on the table for taking the attraction at WDW. See the trend and association here? Changes tied to sponsor $$.
Futureworld was inherently linked to its corporate parents from the get-go. Disney clung to that model far too long and the operating model meant Future world updates were tied to their ability to lure and sway their corporate angels. They attractions suffered, and getting big deals meant 'big changes'.
SSE at least has a plot line that tries to enlighten people to think of communications as more than just what you know today.. but as a critical concept of how we even
got to where we are and a critical piece of how we move forward. It's meant to be an enlightenment story that establishes communications as far more important than you believed prior and uses history examples to illustrate its points.
WoM's story lacked this same enlightenment angle.. instead it basically just focused on the evolution of movement and pushing the tagline of 'fun to be free'... because the notion of personal freedom/movement car manufacturers want to push. And surprise.. it climaxes with the personal automobile of all types for you. The future closer segment is more an epilogue but continues to push the idea 'freedom of movement' rather than the kind of impact/essential/enabler angle SSE uses with communications.
Just because it used scenes picked from history does not make it timeless. It helps avoid getting pigeon holed trying to capture the present or predicting the future, but it still must use references and concepts that will feel relevant to current audiences. That's what sank GMR too - It was centered around a concept (golden age of hollywood and celebrating hollywood achievements) that newer audiences just didn't care about. The scenes didn't age out as much as the very thing the scenes were trying to support did. WoM's punchline is plucked right from the advertising pitches of 50s America. It doesn't resonate today.
While it is certainly true that the Carousel of Progress will stay perpetually out-dated, it doesn't need to stay relevant to still be a fantastic experience. Its dated perspective is what gives it charm and regardless of how relevant its content is, still manages to be highly entertaining.
For fans of theme parks - sure. For rando looking for entertainment - far less. And Disney and its sponsors were not trying to operate museums.
Eventually story telling formats fall out of favor too. HM and POTC differ from the future world pavilions in this manner in that they try to be far more immersive to the guest. You don't just watch a scene as a drive-by, but you are put in the setting, you have sequence of places to build that impression, you are 'transported there' to a far more significant degree than any of the future world pavilions did. These concepts help retain their entertainment value for people beyond just the scenes they represent. These are just some of the factors why shows like them continue to be headliners while other shows that use similar pieces or constructs, have fallen by the way side.
Then you have shows like Country Bears.. and Mr Lincoln.. that really are kept around more for history/nostalgia. Their main gimmic has been made so mundane the show needs more to carry it. Shows like American Adventure add stagecraft to the mix and a far more moving narrative to help carry the load. Tiki Room adds the surround and environmental pieces which give it more uniqueness to help carry it beyond the catchy songs and nostalgia elements.
You can take a 8yr old and put them in the tiki room in 2022 and many will find wonderment and things that will stick with them. That is impact that helps keep an attraction open for decades.
'its fun to be free' doesn't resonate generations later when movement is as assumed as getting an uber on your phone.