User blog comment:RaymondLatu/What is the One Piece/@comment-4493594-20111222104859

It doesn't really matter what it is. In fact I wonder whether Oda will ever reveal it. The reason is pretty simple: Whatever it is, it will lead to disappointment as it will never satisfy the expectations of anyone who ever gave it a single thought. Besides, the one who will without a doubt find it, namely Luffy, doesn't really give a crap about what it might be. The far more important factor is the quest for it (as he already stated when Usopp asked Rayleigh about it.)

IF One Piece is connected to the Poneglyph, which I doubt because the Poneglyph is older than Roger, it would be the key to ultimate destruction and hence Luffy would probably break it.