I agree that the likelihhod of a Hobbit being able to destroy the Witch King is irrelevant. Surely, the pertinent question is whether a male Hobbit qualifies as a Man, and is therefore excluded from the category of beings that Glorfindel foresaw would bring about the Witch King's end.
From
Concerning Hobbits:
Quote:
It is plain indeed that in spite of later estrangement Hobbits are relatives of ours: far nearer to us than Elves, or even than Dwarves. Of old they spoke the languages of Men, after their own fashion, and liked and disliked much the same things as Men did. But what exactly our relationship is can no longer be discovered.
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As I understand it, based upon this extract, Hobbits are a sub-division of Men (like the Druedain) and either awoke at the same time, or were derived from the Men that originally awoke.
Either way, I would classify them as Men. And so, I would exclude male Hobbits from the class which, according to the Witch-King's prophecy, would bring about the Witch King's doom. Ergo, it was not Merry that killed him. It was Eowyn. Although Merry brought about the circumstances that enabled her to do so.