OMG, someone who gets it.
I try to explain this concept often here, but it usually falls on deaf ears.
The very nature of things like health, energy, etc. - they are just impossible to keep up with in a theme park attraction. This historical aspect of EPCOT Center (WoM, etc.) was one thing as history is (mostly, though not always) history (we are becoming more aware of the realities of things all the time that we once thought much differently about), but the "cutting edge" stuff just doesn't work.
It's not even just "keeping up" with it - but also how politicized and ideological things have become today. They not only would have to make constant changes, but also constant value judgements as to what to include and not.
While I was one of those kids that was inspired by the original EPCOT Center, honestly, the Internet really killed that aspect for future generations. You can learn more about a topic in 30 minutes on the Internet, getting the most current information about pretty much anything. Disney just cannot compete there.
I truly admire the original intent (well, the "original" intent behind the park itself, as we all know the long history before that) - that said, while it was remarkable, it simply was not sustainable.