Narya hadn't been cocnceived by the time the hobbit was written, so it helping engineer the trip to the lonely and spurring Bilbo out of his hole couldn't have been the initial idea. However, while Tolkien was conceiving Narya perhaps it was his remembrance of these events that decided what the specific power of the ring would be.
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"Come away, O human child!/ To the waters and the wild/With a faery hand in hand,/ For the world's more full of weeping than you can understand."
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