Look in the thread that was linked to above. Glorfindel said that the Witch-king wouldn't be slain by a Man, not that he couldn't be slain by a Man. It all depends on how you look at the prophecy. In that case, I don't think that a Hobbit would have been able to successfully slay the Witch-king. As it is, it took both Merry and Eowyn to finish them off, and both of them succumbed to the Black Breath. One Hobbit would not have stood a chance.
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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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