Film all three at once like Avatar 2-4?
10 Billion Worldwide
shareIt probably won't happen, because that would be monumentally expensive. The "Lord of the Rings" films were shot that way, and PJ said that New Line had essentially "bet the company" by doing so. Okay, Disney isn't going to be taking that kind of risk, but that doesn't mean they want to lay out that much money at once.
Also, if the fan speculation is true and it'll be centered around the slave kid in the stable who did a force-pull, they'll have to take the aging of child actors into account.