I don't think people understand how DHS works -- while they have added rides over the years to accommodate demand, its not about the rides, its about the shows. It brings in families who pay lots of money based primarily on the shows. People who run from ride to ride are not WDW's target market for DHS -- which is families who come to the park to experience movie-themed activities and go to live shows -- the SHOWS is what brings in business, not the handful of rides which augment it. In fact, the rides LOSE money since they require a lot of maintenance and upkeep and are way more expensive to build than live actors in live shows. The shows are even timed in such a way that you can't see them all back to back, you have to stay in the park and spend time waiting in between...which means more money for restaurants and concessions. For every person who does nothing but ride TOT and RNRC, there are 50 others who don't even venture further than the BATB theater...
WDW long ago conceeded that they have no interest in creating another Universal Studios and that show elements are primary to the park, not rides.