Hmm. Random thought: Do you think it's morally wrong to try and control the actions of future versions of yourself? Like, to try and commit yourself to something you can't get out of, specifically because you think future you might want to get out of it? :/
@Angle I dunno about "unethical", but there's fiction about oaths gone wrong for a reason (e.g. the Oath of Fëanor in _The Silmarillion_, in fantasy; in serious drama the Sean Penn film "The Pledge" comes to mind.)