It's a deus ex. Literally. It is God coming to the rescue. Jake can't save them, their own wisdom can't save them, having allies like Trudy couldn't save them. God had to come to the rescue.
The Na'vi are imitation wise. A cheap, unoriginal version of wise. Nothing they have or do is based on wisdom. Cameron makes a point of trying to tell us it's wisdom, but he forgets about the part where he created all the rules of that universe. He created the rules, and the Na'vi happen to know them (for, what we are shown, are completely biological reasons moreover). Wise characters have to be wise without the specific rules of that universe for them to be actually compelling and their wisdom to mean anything.
Yoda is wise even without the Force. Gandalf is wise even without his wizarding powers and knowledge of Middle-Earth history. Take away all the shit that Cameron made up and what you're left with is a bunch of haughty smurfs.
You're not seriously suggesting there is a deficit of imagination in any of the work by the single most influential fantasy writer in history, are you? Yep, you're trolling. Okay.
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