I think that the idea to turn EPCOT into a theme park rather than a city happened after his death. I may be wrong about that, but I recall reading something along those lines a few years ago.
Yes, as he didn’t even live long enough to see Walt Disney World open much less EPCOT, MGM, and the others.
From what I’ve read, Walt already had come to understand that he couldn’t control people’s behaviors the way he wanted to at EPCOT-—it was just a violation of civil rights-—and his execs made the changes after he died.