Tolkien said that Olórin was the only one who stayed faithful to his mission, so we do know that they failed. However, other than that, I think that Tolkien left them as a mystery to make Middle Earth more real and much bigger than what is written in LotR.
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Many that live deserve death. And some that die deserve life. Can you give it to them?
Then don't be too eager to deal out death in judgement. For even the very wise cannot see all ends.
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