I know Retro Epcot died a long time ago, and have accepted it'll never be what it was, but if you're going to evolve the park - it still should have an underlying theme. Although not as directly as it used to be, USF is tied together with movies coming to life. IOA is tied very loosely with literary adventures. If you had to explain Epcot, how would you go about it - and what separates it from MK or DHS?