Humanity is headed for a brick wall. A combination of Overpopulation, and Automation is going to create a crisis before the end of this century that will validate many of the Biblical predictions of Armageddon. Half the global population already lives in poverty, and the population will nearly double by the year 2100. At some point, in another few decades, all Hell is going to break loose, and there will be one more Massive War. It will not be Nation against Nation, but rather the Have's vs. the Have-Not's. It will depend upon whether the Have's run out of bullets, before the Have Not's run out of bodies.
If the Haves win, nations will come together under a common government and language, and Mankind will reach for the Stars. If the Have Not's win, humanity will revert back to the Dark Ages.
None of us Seniors will live to see this day, but our Grandkids, and beyond, will face a future that few alive today can imagine.