There's a lot more USB than the ports are available, so some of them are gonna expire without one. The deaths of these will help rebalance the books. It's sad, but it's inevitable. Also in a sense, this gap will reduce the population of the lowest income bracket group of the Han ethnicity since these dowries also means a wealthier single male has a more darwinian competitive economical advantage over his less fortunate peers, leaving the poorer ones to fade into history.
Other trends we may see will be of course, the inverse flux of females being born, or an increase in marriages with minorities.
Assuming birth rates of both genders are balanced starting from today on, it will take 90 years for China to completely rebalance itself. This is because 90 years later, the surplus will die out.