Ehhhhhh... yes and no. The 60s NY World's Fair is the most direct influence, but the technological triumphalism and celebration of a corporate-built future was absolutely fundamental to all American Fairs, and pavilions with exhibits celebrating this were just as central as the international exhibits. After all, the most popular and culturally resonant element of the very first US Fair in Philadelphia in 1876 was the massive Corliss Centennial Engine, which powered the entire expo and in which various great literary, political, and corporate minds saw the dawning of a new age. Really, the technological and international components can't be separated - the ideological foundation of the fair was the interaction of the two.
(And if we're looking for very direct influences, NY 1939, which featured a giant ball as the centerpiece and a popular robot show gives the 60s version a run for its money.)
I do think, however, that one way forward for EPCOT might be to start looking at the Fairs more broadly, bringing in elements from expos other then the 60s NY ones. This could open up a huge range of architectural, design, and thematic possibilities while still remaining true to the founding spirit of EPCOT.