I find this question kind of funny. I already feel that "that everything is permissible and nothing is forbidden", and it isn't DEVASTATING in the least; it's liberating. I already commented in this under "Heading Towards Morality". Morals are just opinions, and justification is irrelevant. I don't need to justify that I enjoy pie or dislike country music any more than I need to justify disliking murder and enjoying sex. I think it can be jarring, certainly, to make the transition to such extreme relativism, but I would not call it devastating, necessarily.