Well....I meant I would give Moana a pass for being an old story, not for being an ideal fit into Epcot, which deals with other issues (innovation, future, etc.). And while I take your point about video games and superheroes, if we're going to that level of abstraction, we could probably make an argument that nearly anything would fit into Epcot, which then becomes meaningless. And that's kind of the current problem.
I don't think the Moana story itself fits in Epcot thematically. That having been said, if this is anything like the concept art, it doesn't look bad (partially because I can barely tell it's Moana themed).