If the China continues growing rapidly, the US will once again face a potential peer competitor, and great-power politics will return in full force.
With the end of the Cold War in 1989 and the subsequent collapse of the Soviet Union two years later, the United States emerged as the most powerful state on the planet. Many commentators said we are living in a unipolar world for the first time in history, which is another way of saying America is the only great power in the international system. If that statement is true, it makes little sense to talk about great-power politics, since there is just one great power.
But even if one believes, as I do, that China and Russia are great powers, they are still far weaker than the United States and in no position to challenge it in any meaningful way. Therefore, interactions among the great powers are not going to be nearly as prominent a feature of international politics as they were before 1989, when there were always two or more formidable great powers competing with each other.