I don't dispute the inspirational and aspirational goal for EPCOT Center. But Disney's business model was: We're going to build an energy pavilion and have Exxon pay for it; the Bell System will sponsor a communications pavilion; Kraft will be happy to pay for one that focuses on food and farming. They could offer 10 million or so visitors a year (a captive audience) for those corporate underwriters. Over the years, the internet and other technology has given those same companies cheaper and more expansive ways to reach their customers.
Walt Disney's original vision for his Community of Tomorrow suggested that it would always be "showcasing new technology." They tried to incorporate that into the original Communicore (and later, somewhat, in Innoventions).
I still LOVE Epcot. Horizons was my favorite pavilion. I honestly think it might still be there if its sponsor hadn't acquired its own theme park just up the road (especially since GE had such a long history of collaboration with Disney dating back to the 1964 Worlds Fair). There is no question that the park has been in decline for the last fifteen or twenty years. World Showcase, at its opening, touted three additions that have never come to fruition (Spain, Israel, and Equatorial Africa). Where there was once room to showcase 19 countries, two of those have been taken up for the Frozen expansion and Remy's Ratatouille ride. I also understand that consumer desires change. Six pavilions with slow-moving dark rides isn't in fashion any more. We want thrills along with our entertainment. I still think Disney can achieve that while at the same time inspiring creativity and innovation. I look forward to D23 and (hopefully) a better look at their vision for a new Epcot.