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I'm not sure I love that she wrote this so early on... I think a writer needs to let her story evolve organically. If she had that many specifics already in place, did it sort of lock the characters in? Would Harry and Ginny have really ended up together? I dunno.
Which, in the end, is one of the great themes of the series: friendship. Harry could have gone all seven years attempting to do everything by himself, but he never would have gotten anywhere without the help of his friends. Rowling has said that true magic is friendship, and I think it's only fitting that Voldemort was defeated by many brave people, not just the Boy Who Lived.