The ride in Hershey's Chocolate World in Hershey, PA, opened in 1973. They've consistently updated it about once a decade, with a big overhaul in 2008, and as a result, it remains extremely fresh and popular. The 1973 version would feel quite dated, but the 2008 version does not at all (I don't want to get into the 2016 changes). You also get a free piece of candy after coming off of the free ride. And for a chocolate company, they make one hell of a lot of dough!
My point is Epcot could've stayed just as fresh and popular.