At many points it is suggested by Elrond, Gandalf and the rest that there is someone guiding events.
"Bilbo was meant to find the ring, but not by it's maker" is one of the hints. This entity could well be Eru. If this is so then he would probably have made sure Sauron was destroyed somehow. However, it might well be that if Frodo had not gone alone with Sam to put the ring in the fire Sauron would have triumphed, at least for a while.
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Fearlessness is better than a faint-heart for any man who puts his nose out of doors. The length of my life and the day of my death were fated long ago.
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