ToT is not the central thematic icon on DHS, the Chinese Theater is. The Chinese Theater is the weenie at the end of the park's version of Main Street, it's central to the park's movie-theme, it was featured everywhere in the park's marketing (here's a poster I got before the park opened), and the attraction they put inside was a wide-ranging, all-encompassing family-friendly thesis-statement attraction to make the case that "movies" are worth celebrating. If guestst didn't buy into the premise that movies were worth celebrating, everything else in the park was of no/lesser value. Why care about backlots or stunts if movies aren't important? That's what a thesis statement attraction is for.
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(ToT was built on a side-street five years after opening and happens to be the tallest attraction, and a very cool, very popular attraction, and therefore is loved and recognizable and much more usable in marketing than the park's other beige soundstages, shows, and nondescript buildings, which do not lend themselves as much to marketing. ToT is not the geographic, thematic or spiritual icon of the park, however prolific its appearances are.)
Spaceship Earth was smilier to TGMR in having the most encompassing content and acts as a thesis statement establishing that the whole park's theme/content is important and worthy of attention. This attraction conveys the story of human communication which is fundamental to all its other achievements.
The castles at Disney's castle parks have a mix of walk-throughs and other amenities, with variations and exclusive experiences in different locations, that appeal to all ages.
My point is specifically that when you have a park with an overall theme or mission, such as at DAK or Epcot or a movie studio park, and you have a central icon for the park both geographically and visually and in marketing, it is a mistake to have guests of all ages show up and find an attraction dialed in to one demographic, age level, or rider-profile.
It shouldn't be a coaster OR a show geared just for kids. It should be an attraction that conveys what the park and icon are all about. It's not just "another venue" to stuff an IP into. There's a hundred acres to do that. And, sure, maybe Spaceship Earth should have a little bit more zest, I'm not arguing against that. But it should be an attraction that kids of all ages, parents, and grandparents can all enjoy.
And sadly, Disney was once known as a company uniquely and cleverly skilled at making entertainment that spanned all ages, on screen and in the parks. That, I believe, was central to why the company has been successful and is still around 100 years later. That (along with execution quality) was the company's "secret sauce."