I think the pitch should be Discovery. I think the Society of Explorers and Adventurers is a ridiculously strong theme that could anchor what is now Future World in so many different ways. You could see great modern minds rolled into this, but also those explorers highlighted in Fortress Explorations at DisneySea. The front half of Epcot should be about past, present and future of Discovery in the way that Spaceship Earth handles the past, present and future of Communication.
I could see Elon Musk be an "explorer" involved with Space exploration alongside Neil degrasse Tyson. I could see the Dreamfinder being an explorer into our Imagination. I could even see James Cameron be an explorer into the sea over in the Seas pavilion.
@lentesta mentioned this on one of their recent shows. These are concepts that could tie the entire land and park together that could be conceptualized over a long weekend.
If Chapek announced tomorrow that Epcot would be overhauled with a Society of Explorers and Adventurers focus in the front half and culturally relevant IP and non-IP based additions (Ratatouille, Coco) to World Showcase, I would be 100% on board.