Parks that are built with an understanding that shows will alleviate their low capacities should have shows (cough DCA, cough USH, cough DHS till last year)
This is something the foreign parks seem to understand a lot better, Walt Disney Studios Paris has five shows running simultaneously in theaters of varying sizes. Five! Because they need it! Hong Kong Disneyland is building another theater as we speak! Don't even get me started on how many theaters they've got in Japan.