Gandalf said that it was good fortune that brought him and Thorin Oakenshield together in that tavern, and it was good fortune. If the Quest of Erebor had not been successful, then there wouldn't have been an Eriador to return to. Even if Smaug didn't join the fight in Gondor or Mordor, he could have completely destroyed Eriador and left nothing for the Host of the West to return to.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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