I don't think so. It's not actually world peace that you are saying, it's more on standing alone and not depending on the government's issued money. If you want to remove government's dominance, it will just cause a conflict between the citizen's and the government so there would be no world peace. And what's the purpose of having a government if you don't want them to rule your country?
Having decentralized currency won't lead to a peace. It isn't all about money. How about war, can Bitcoin help to stop a war?