Take a cue from the queue. Notice all the trivia questions are about the Land all over the globe, including Antarctica. A new film should incorporate beauty of the land from many nations, and lands. The current film, made for Soarin' Over California at California Adventures, can remain there for many years and still hold it's relavancy. Epcots ride clone, Soarin', used the CA film as a cost saving measure. We can expect a new one, tied with a grand publicity campaign, but as long as the lines remain as long as they are, top management will say "Why now?" In this regard, more theaters would be more cost effective. There is room enough to double the ride building (check Google Earth and see there is just parking behind the current building) and the same entrance and queue could feed to it.
Side note: My daughter first thought it was a Lord of the Rings ride. (Not Sauron, Soarin'!)