Will we see world peace in our lifetime?Watch
To answer the original question, no we won't unless we live under a dictatorship which forces us to live in harmony at the cost of our freedom.
If for example, however, the US was to have a commitment to a non-violent philosophy, for example by taking the unprecedented step of destroying all of its weapons of arms in a leap of faith, then other nations might follow. Dr. Martin Luther King Jr. has suggested such a means of international policy, in keeping with his commitment to non-violence. He justified it on the basis that, well, all of the other means of international diplomacy has failed...
Far from peace i see a continued Muslim civil war and a potential west vs Islam fight too. Sub-Saharan Africa may slowly improve. China and India will soon be sufficiently powerful that they must be afforded equal respect with the west or a war could come. Russia needs dealing with.