Don't forget what Galadriel said to Sam when he looked in the mirror "Some never come to be, unless those that behold the visions turn aside from their path to prevent them". If Galadriel had warned Aragorn what could he do... go with Boromir immediately to Minas Tirith forsaking the rest of the company or taking them to where that authority of Denethor could not, at that point be resisted easily? Boromir's fall was vital to the success of the Quest as things turned out.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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