As a genuine question, I wonder whether part of the reason is that Disney sees AA shows as a thing of the past? Up until the 1990s, they used to open them and always propose them for new things. It seems in recent years, though, that they mostly keep the existing ones running and never add new ones when building new lands and parks. Does anyone know when Disney last opened an AA show?
Are we counting Le Visionarium in Paris, or Alien Encounter? Not as many as previous shows, but they had a few.
Golden Dreams at DCA was supposed to be like The American Adventure, but became a movie due to budgeting.