I used to think that, but IMO, that kind of idea died once said companies could make their own content and distribute it easily on the internet. It's easier for them to "show off" that way rather than an exhibit at Disney.
I do think it's a missed opportunity to make a STEM-focused pavilion based on the Imagineers' work, however. Joshie showing animatronics off by SXSW - something like that would've worked to keep Epcot close to its theme and made it "more Disney."
All in all - and this has been mentioned before by others - a ton of money has been spent on Epcot, and it's probably no better with its overall theming issues, and I'd argue it's worse than before.
Unless you believe the theme of the park is "The Walt Disney Company's Treasure Trove of Intellectual Property", which it appears to be for all parks now. Which is a shame to me because I think it hurts the variety the parks once had.