Instead of being taken by force by Madara the other 7 bijuu will merge with Naruto, but only until Madara is defeated. This will allow the soul of the sage to take over Naruto. When he notices all of the allied forces working together he will congratulate all of them for becoming peaceful before...
Okay so I see most people posting predictions since 618 was released, but I have a few that I haven't seen others post..... while a few were probably posted and I just didn't see them.
This all takes place after Sasuke learns what he was searching for since I am sure that this will take place...
He doesn't use it because it doesn't peak his interest. If you haven't noticed Madara likes to play with his opponents. This is probably what will get him killed in the long run.
The answer to your question is to bring about "true" peace by capturing the entire human race in a genjutsu that is manipulated by the caster. Yet is it "true" peace if they are all living a lie?