I do have to laugh at this. You're saying women don't appreciate Science, History, and Imagination? Those things should and can be for anyone, or at least most should have the literacy to understand a captivating presentation that really tells a story.
Think of the ambition of SpaceShip Earth. Telling the story of how we communicated from the dawn of civilization. That's powerful stuff and they execute in a fun and exciting way. Compare that to the story Nemo tells...
SpaceShip Earth is more ambitious. They're not even in the same ball park.
I'm not saying it, the crowds (or lack there of) are saying it. I am not going to argue on the merits of it, but historically the whole science/technology/history thing has been traditionally the foray of middle-age/older men.
Of course I'm sure all of this is completely irrelevant to present day guests who are wedged into their accessibility scooters and only want to know where the nearest place burgers are sold.
The whole idea of a world's fair concept of science/technology/history is lost on todays guests. Maybe in 1982 it would have been appropriate. (Even then maybe it was a decade or two too late) However, to push the idea in hopes of cultivating a different group or demographic of visitor is not realistic. Epcot is not a form of higher education. It is a place that should enlighten and expose people of all ages and backgrounds to new things, while at the same time keeping people entertained. Sticking with tired old ideas and mediocre ideas do nothing to solve the problem.
Going back to your comparison with Nemo, the story may be watered down (no pun intended), but it does gather a lot more foot traffic than its previous incarnation and the level of participation in the character overlaid activities beyond the ride is significantly higher. The park needs to adapt to be better. Compared to everything else at WDW and USO, Epcot is going backwards only held up for now by seasonal events. Disney could surely do better.