Disney is definitely trying to bring more family appeal to EPCOT, in an age where it's lost some appeal. What between frozen, ratatouille, guardians, (coco maybe), and Mary Poppins coming in. And toddlers are much easier to take all the way around world showcase if they can stop for Mary, Rat, and Elsa on the way around. Not to mention kids will always be any any disney park regardless of any adult-aimed seasonal events. Might as well throw them a bone. And a quaint Poppins-inspired carousel, I think, fits more in world showcase than a few things that are (or will soon be) residing in world showcase.