I think seceding from WDW would be a great idea for the complex, because in order for it to be something really cool -- what it could be -- it needs to get out of the "we demand to be entertained" business. Epcot could be really amazing as a museum -- it's got all the infrastructure it could need for that, to be a real place of education and wonder. Those WS pavillion would be amazing -- if they scienced-up Future World, there's remarkable exhibits that could be used. Just think about that -- a 300-acre museum. I6 would work -- Sea World brings in plenty of people, and it's really just a big zoo with shows. Epcot could easily be much more than that, and if they took away the expectation of rides and of being entertained, they could have a really amazing place. It's the attachment to the idea of a theme park that makes it disappointing to visitors -- if you weren't comparing it to MK, and weren't making it a part of the WDW experience, my guess is there'd be a lot less disappointment in it. The same thing, really, with the other two parks. They suffer in perception because they re always being compared to the MK, even though none of them have the same mission.
Epcot's biggest problem is that because it's part of the WDW, it has to entertain the people who come. Just read these boards -- all you hear about Epcot is that it needs more rides, more "fun" things for kids to do. And while that's a noble goal, trying to be both a museum and a theme park is what causes Epcot to reduce its own possibilities.