I think that the Capitol is there because it is a name? Not because there making weird combinations of upper and lower case letters. It's like writing out John or John... And I do not think the c is meant to be upper case, only to fit around the o or SSE symbol.
EPCOT's original plan ended with Walt's death, the imagineers wanted to continue his vision, but didn't have his ideas to make it more like what he wanted originally.
Lots of things changed around that time, they removed the Mickey hand with 2001 on it on SSE, i think due to the new century, since it was originally supposed to show the 21st century in the 20th. Now that it is the 21st, why would people want to, or they think people would want to see what's going to happen yesterday from a persons view of it 30 years ago.... I wouldn't!
Yes it's become more on a theme park over the years, but after Walt died, It was made to be a theme park, and they have to compete with other places.
As more people can learn about future technology and history's accomplishments online, Disney has been and continue to slowly adjust there rides to allow people to use google than come to the parks.