While it's easy to speculate that China would create an army out of them, I tend to think not. First, it would be ruinously expensive to build, and even more ruinously expensive to maintain an army like that.
Second, it's difficult to imagine China finding a use for them that doesn't end up causing more problems than it solves. Invade Russia or India? To what end?
Finally, the soldiers aren't robots -- they'd know that they're cannon fodder, and would eventually take umbrage.
No, my guess is that one way or another they'll all be used up in China's next civil war, to which this gender imbalance will inevitably lead.
Embark on a “Homosexuality - good for the Fatherland!” campaign?
Maybe, just maybe one of them will marry Maureen Dowd.