The previous US President is currently being investigated for leaking nuclear secrets. During his tenure, he went from being a reality TV star to having control over the most sophisticated nuclear arsenal in the world, with a system expressly designed to enable the President to have unilateral control over the launching of nuclear weapons.[0]

Currently, a large portion of the voting age US citizenry no longer believes in the peaceful transition of power. The highest instance of the US judicial system is under the control of specific authoritarian and religious elements for the foreseeable future. We can't know how the US will evolve next, but the picture doesn't seem really rosy at all. We don't know when the next reality TV star or populist politician will take control there, or which ideological movement will capture the institutions in the next few years. Given the country's history of intervening in other nations, we can only guess at what the consequences would then be for the rest of the world.

Given all of this, having no superpower would seem preferable.

[0]http://blog.nuclearsecrecy.com/2016/11/18/the-president-and-...