I'm guessing dystopia. All the corporations merge together under one banner, make and train a military strong enough to take down all world powers, and declare the world theirs. Totalitarian rule ensues, every civil right, constitution, and human right gets crushed to dust and snorted, and those who either refuse to obey the new world order and/or rebel would be captured and have their organs harvested while they're still alive, and the rest of them converted into nutrients to help the soil stay alive, or they would be converted into a meat product no one has any idea what it is, but it will no doubt taste good and be popular. Military police and surveillance would be constant, and if people wanted to serve in said military, they'd go through a possibly life-threatening training process, and failing any part, they become live targets to those that can succeed. Religion would no doubt be all but completely destroyed within the confines of corporate rule, with active practitioners locked in gulags and actively experimented on.
That's my prediction on what may happen. Either that, or the UN would split and nuke each other, creating a Fallout-esque scenario.