I see that as a major risk factor for the world. It means that right now China has hundreds of thousands of angry young men who can't find a wife - in other words, they have the potential to field a massive army. Especially if these men hope to get access to women as part of their conquests... But as their population ages and declines, the potential size of their army declines also. So it may be that the next few years are actually a peak in their potential military might, a window of opportunity for China that will close at a clearly calculable date, that they may choose to take advantage of before it's gone.but all this is exacerbated by their longstanding one-child policy, which led to mass abortion of female babies and an overabundance of men to the point that, even with the implementation of government-sanctioned prostitution, most men have no possibility of getting laid much less getting married.
If they do collapse domestically, a war is also a great way to distract from domestic troubles and unite the people behind a single patriotic cause.