Please tell me where your local science museum is which features rides about communications, future living, transportation, and energy on the epic scale once presented in Epcot, because I'd really like to come ride them. I'm also not aware of any "learn only types of attractions" in Epcot Center. The whole point was an utterly enjoyable, fascinating exploration of seemingly mundane subjects which were so enjoyable and emotionally thrilling you didn't realize you were learning. There is a saying that learning can be fun, and it is very true, even if usually it isn't. But it is also why the original Epcot was so awe inspiring.
Of course, nobody outside Disney has ever done anything remotely like the Future World that we once knew, and millions of guests eagerly bought tickets and lined up. Probably wasn't a thrill freaks favorite park, but it never will be. While it is desirable to have something for everyone, it need not have destroyed the character and foundation upon which the park was built. To call Epcot "a very expensive science museum" is like calling the Magic Kingdom a (permanent) roadside carnival.
Further, theme park attractions - at least in Disney parks - should not (and mostly don't) revolve around the ride experience itself. It isn't that there is a place for storytelling - but rather that the story (not necessarily storyline) is central to the attraction experience; The ride is merely the vehicle used to convey guests through the story or experience.
The greatest crime committed by Mission:Space, however, was that it largely omits the grandeur and awe inspiring experience of space and instead presents the physical sensations of spaceflight that make you want to puke. This was previously, if crudely, done by Mission to Mars and Space Mountain - physical ride experiences (not theme or indoor setting) not radically different from roller coasters around the world.