Chinese leaders in the foreseeable future will have no time to think about the eradication of the japs but it should be done-- like what happened to the Mongols and Manchus, and it is not necessarily done by design.

The US will remain formidable in the foreseeable future and, to deal with it, will occupy most of China's attention and energy. Over the long term, it is less clear. If, and when, the whites there become the minority (say, less than 40%), then China should work to split it along ethnic lines. Same with the major European powers.

The long term threats to China will be Russia and India. The former becasue, from time to time, it could muster enormous energy for expansion and therefore threatens China as it had been. The latter for its sheer numbers.