But just how far should Epcot go in accommodating the shallowness and stupidity of some of its guests?I think a lot of casual Disney fans may agree with you. As a local, I've had the opportunity to see IllumiNations a lot and there is no doubt that the middle section as the Earth Globe moves into position is considered 'boring' by lots of people and they just bail; I see it all the time. Many people I know who have seen it many, many times over the years have come to refer to that segment as the 'intermission'.
Most people who experience the show have no clue (or care) what the story arc is or what the symbolism of the evolution of the planet is; they just know they find that section very boring and many move on to do something else in the park. That doesn't make it a bad show but it does suggest that it may need some updating to keep today's audience more engaged the entire length of the show.
This site started as an Illuminations site, and probably wouldn't exist if Epcot had just done an MK-style fireworks and characters show for kids with short attention spans.