I get why they did it, but it feels like something is lost as a result.
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Whether he could have stopped it is debatable. IIRC for most of the book he talks about a “Golden Path” that would avoid it, but he might make some comment towards the end to the effect of “that was never realistic, anyways.” Although that could just be cope at that point. It also seems clear that him dying could have stopped it, and there are multiple points where – despite his prescience – he senses he is in real danger of dying.
Great point on the sandworm metaphor, too.
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There are several instances in which he sees his death as a possibility, but then concludes he’d become a Fremen martyr leading to the same universe-spanning conquest. He also foresees his sister standing in for him in an instance, and concludes this would be just as bad. At the end he realize that he never really had a choice in the outcome, only the particulars.
Ahh that sounds right. Time for a re-read.
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The best Dune prescience moment for me is in one of the sequels when Paul gets blinded but has done so much space acid that his future sight is constant and precise enough that he can function as if he can still see. I shoehorned that bit into the ending of a homebrew D&D socialist-noir campaign once, fond memories.