User blog comment:Omega natsu2/Chapter 385: Spirit King vs. Demon King, Predictions./@comment-4829046-20140528062816/@comment-4829046-20140528090249

Exactly. There is no ultimate cure. Nothing is black or white. Even the Infinite Tsukuyomi won't remain like that forever. War, pain and suffering will always return, besides, what's to say the dreams have no killing in them? They would have to be scripted and put in a constant loop and as sci-fi stories have shown, does not work for eternity. Maybe a couple billion years, but never eternity. The universe itself couldn't give a damn about how Earth's species do things on their planet after all.