Sora is arguably bigger than Cloud, just less iconic. The problem, I believe, is that people do not know he is owned by Disney and not Square, that was my problem. I had no idea and therefore I thought he had a decent chance.
Nah, I always knew he was heavily requested. He is one of the top dogs. But again, Disney. All of the other weird choices are up to Nintendo. If Nintendo wants Doom Guy, we get Doom Guy, if Nintendo wants Banjo, we get Banjo, if Nintendo wants Sora... Um, it is up to Disney. In other words, video-game companies are interested because it promotes their characters. Disney is not a video-game company, and they are probably the biggest entity in the world. They could care less and might genuinely demand Mickie Mouse or bust.
The only way I see it happening is if Square Enix pushes for it as well and they both approach Disney together. That is somewhat doubtful, however. Especially when there are plenty of other Enix characters in the sea.