To give a counter example, take a look at India and China, the two most populous nations. In both cases there is a huge migration from rural to urban centers but Social expectations, Cultural norms, Family structure and Economic necessities give youngsters something to strive for. In China in particular; you have entire villages populated only by Grand parents and Grand children because the Parents are away working in the City. And yet the situation is not dire like what is being painted in the article in spite of many problems. In India the rural to urban migration is not that vast compared to China so the effects of Family/Social/Cultural structures are even more stronger.
Freedom/Progress needs to be balanced against Structure/Discipline for any Society to thrive. This is the reason all societies from ancient times always put Family/Clans at the center and enforced Discipline via Religious diktats/Cultural norms/Social mores etc. While many of these should be revised in the modern context their complete dismantling has left many adrift and in a existential crisis.