This is a very naive conclusion. Human societies deal reasonably well with a large female:male ratio (usually after a war) but large male:female ratios usually leads to war, revolution, or unpleasant social changes like fast increases in violent crime rates and similar problems. This has happened in the past on smaller scales, but in this case you are talking about regions with 10s of millions of young men who have almost no chance at reaching the societal norm of a wife and child -- they are not going to be pleased when the reality of the situation starts to make itself apparent.
If men are prepared to wait until they are older and richer then you will find this cohort out-competing their younger, poorer peers for an ever-dwindling supply of young women. This just leads to a repetition of the cycle but with more and more competitors fighting over the pool of "resources."
This is not a situation that is just going to fix itself unless there is a radical change to family planning laws, societal norms, the role of women, etc. The only thing that can really be said is that the solution will be painful and its consequences could end up being quite far-reaching...