I like the Moana idea because I think it will add beauty to the park in a fun way that will be a treat for kids and hopefully something to behold for adults. I've personally given up on the EPCOT Center idea at WDW as it just gives me a headache to try and hold onto it (since Disney abandoned it long ago). Having said that though, I would have preferred a Moana dark ride in the Magic Kingdom and I think an IP like WALL*E is a better fit for EPCOT if you must bring in more animated characters. I love the whole movie, but the concepts at the end where humanity basically comes together to rebuild a life on an abandoned and practically desolate Earth using technology, ingenuity, and will power, etc. tie into EPCOTs original vision better than Moana....but I'm still happy.
Edit: Even the music sounds at times like it was written for EPCOT.