Anyway it's academic at this point I suppose, it's not like they will expand the land just to add something as basic as a carousel. If the one ride they do have proves a massive hit, maybe they will build something else, a C or D ticket, to absorb part of the traffic into the land. That's one of the things Animal Kingdom got right with the Pandora land; Flight of Passage is obviously the big hitter but a good number of people, who might not have researched the park as thoroughly, get diverted into Na'vi River Journey. FoP queues are already enormous, imagine if the land didn't have a second ride. (It has to be said, though, that River is so short that people are out again in a flash.)