I don't see the problem going away or even abating until the legal codes in western cultures (and apparently a few eastern ones) are more equal in how they treat the sexes. People have been brainwashed into thinking women are on the short end of the stick, but the exact opposite is really the case. We live in a gynocentric culture that puts women first in nearly every situation. Japan takes it to the extreme.
Can anyone really blame their men from want to walk away from it all?
They suffer extreme stress during their formative years to make the best grades and to get into the best schools.
If they don't meet some arbitrary threshold, they're defaulted into a life of drudgery.
Even if they have a "good" job, they work 70+ hours per week.
If they have a family, they rarely see them and they're not likely to appreciated.
If they get a divorce, they'll lose everything to the point of not being able to live. Suicide is often the preferred alternative.
When you're raised in misery, expected to live in misery, and die in misery, why the hell would you participate in the system?