Something like the "bipolar hegemony" of Great Britain and Russia after 1815 (though other players like Austria, Prussia, and France mattered) could be reconstituted, with the US and China substituting for Great Britain and Russia. This seems to be Henry Kissinger's ultimate dream - a dream that one can glimpse in his latest book, Germanically entitled World Order: Reflections on the Character of Nations and the Course of History.
If the next world war is to happen, it will most likely be in Asia and feature a clash between the incumbent hegemon, the United States, and the principal challenger, China. The good news is China does not want war now and in the foreseeable future, primarily because Beijing knows too well that the odds are not on its side. But if we look ahead 20 years from now, in 2034, the odds will have shifted significantly.