If you did eventually wish for death, then you would have judged that death is the best thing you can wish for, after having tried as many alternatives as possible.
Are you going to try to use your prior (I don't want to die) to argue with your future self who has experienced the results (and determines that you would be happier dying right now than getting any wish)?
I would not want to kill myself if my distant-future self wanted to die or wanted me to die immediately. I think it is much more likely that I would accidentally self-modify in a manner I wouldn't like if I reflected on it now and that would lead to wishing for death than that my current self with additional knowledge would chose death over omnipotence.
I don't think the factual question "would I be happier dying right now" would necessarily be the one that decided the policy question of "will I chose do die" for both me and my future se...
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