Humor-based shows/rides don't age well. Horizons-era EPCOT had a few--Kitchen Kabaret/Food Rocks, World of Motion, some throw-away stuff in Communicore. Superstar Limo was the first or second casualty in DCA (along with a tortilla-making exhibit, to show you the level of competition). No one cried when UOR retired the pop culture reference-heavy Sinbad. To the extent CoP still works among hard-core fans, it's despite the humor, not because of it. As Nick points out, none of the humorous shows have aged well with the general public.
Also don't forget that humor is a very cultural-specific thing. Even between the US and UK there are differences, and those are only exacerbated when English isn't your first language. For a park that will eventually rely on a ton of international guests again, I'm not sure jokes about American history are relevant enough to build an attraction around.
Mix in an IP with no relevance to people under 35, and you have an attraction that everyone will be walking past in 5 years.