Okay, here goes. Shoot arrows lightly.
1. Mega-Starbucks
2. Since problem seems to be sponsorship, see #1 or quick, without overanalyzing and justifying (your love) it, name one corporation that HAS to be in Epcot for them to make money. Can't think of one, me neither. That is the hurdle TDO can't leap over.
I like the BH6/Science Fair/Expo ideas, but who is gonna pay for them? Here's one far-fetched idea. Get Universities to incorporate both a meaningful futuristic display (College of Science or Engineering or Nursing or whatever), have their Business School work on how it operates, plug the school (for admissions leads), sell alumni gear, whatever other tie-in there could possibly be for university involvement, and there you have it.
Second far-fetched idea. Future Energy technology minus Ellen.
Other far-fetched idea, but have E3/SXSW type booths for current communication leaders (i.e. Facebook, Linked In, Twitter, Net Flix, Hulu, etc). I know, lame, but could be better than empty (read soon to be demolished) space. Booths could be added/updated as needed. More churn, but that is the future.
Far-fetched idea #4, remove all signal ability throughout the park (except 911 of course) and force people to IW to get a signal. That will really drive the attendance.