‘At the same time, what happens when you have a whole class of men who can't find a spouse? They may already feel economically exploited and politically disenfranchised, and you add no family life to that?’
In the context of China I would expect exactly what it is happening - increased trafficking of women and girls and civil unrest. There isn’t really a way to resolve that for the current generation because the sex ratio is so unbalanced. There might be a way for neighbouring countries to prevent trafficking through increased anti-trafficking policies and enforcement, if those countries value their female citizens.
Where this doesn’t translate is in Western countries. I have an attractive late teens daughter. She has received no offers of family life from men in their teens or twenties, incel or otherwise.
One of the major changes in monogamy is that men in their teens, twenties and even thirties don’t feel ready to get married and start married life. My grandparents were married in their teens. My parents in their early twenties. I was married in my mid twenties. My daughter doesn’t really want to date men her own age because if the relationship continues it is highly unlikely those men will be ready to get married in a few years or maybe even in ten years.
And I have seen so many women end up with no kids due to being dumped for younger women after long relationships in their twenties.
So incels in the West may want Alex, but they are not generally offering family life.