Not to waste too much time with armchair imagineering, but I'd love the idea to see more space dedicated to the Future World theme concepts (communication, energy, future living, etc.), but with added cultural space in Communicore that Disney could use for outreach to local arts, tech, and academic communities. Like, maybe a room for ensemble musical performances by local or college orchestras, or a scientific concept demonstration space, or a forum room for academic presentations or debates, with each visitor for each purpose wearing a name tag with a corresponding pavilion logo. Here for the discussion of alternative fuels? Here's your Energy pavilion name tag. Performing with the chamber group? Here's your Imagination (for the arts) logo. Discussing new city layouts for future planning concepts? Horizons logo, etc.
Again, blue sky, but it'd be great for those buildings to actually have a purpose, and keeping a strong relationship with local schools, artistic groups, and the like could ensure that they'd actually get used and not grow obsolete as quickly as Innoventions did.