You're describing blue-sky concepts. That's never gone away, and never been implemented without comprimise. This is a business. Sponsors paid for attractions and influenced their design and vetoed concepts. Disney can still design and build anything in 3-dimensions, but the bigger the dream, the bigger the risk, the more the need for financial certainty. I don't see it as a film studio mindset, but corporate synergy and Disney has become big enough that it should be able to flex all its arms and get results without having to call up Monsanto and the like. That doesn't have to mean characters. Disney has National Geographic and I'd love to see more of that implemented into EPCOT. But they also have a very popular brand that is chock full of fictional scientists that is used in the real world to get kids excited about STEM education.