It is not many thousands of men who can't marry in China - it is many millions.
It is estimated that by the middle of this century there could be 80,000,000 reluctant bachelors in China. That's eighty million, in case you think I have put more zeros than I meant to put. That means there will be many hundreds of highly aggressive gangs who will kidnap and rape women, or who will invade neighbouring countries to kidnap women. Except that many neigbouring countries have the same problem. And don't think that women will attain a higher status - they won't. Women will be used as chattels. Already, rich chinese families are buying girls from poor families and bringing them up as future brides for their sons. Unfortunately, these prisoner-wives are almost always bitterly unhappy.
That's what you get when son-preference is taken to the ultimate.
If anyone wants to know where I got the facts, reply , and I'll check some titles on a notable book-supply website.