I don't think that Sauron's victory was in any way possible: Eru would have intervened, but in a subtle fashion. Actually, that is exactly what he did - he allowed Bilbo to find the One Ring (at least that's what Gandalf suggests) and he resurrected Gandalf after he had been slain by the Balrog. Neither of these was a massive earth-shaking event, but yet without them the powers of good would have utterly lost.
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