Earlier quoted context omitted.
As someone who is doing well financially I don't think you found the reason. The gist of it is: There are worlds and circumstances into which people want to bring kids. We mostly failed to create that world and those circumstances. If tou want to know what a solution looks like look at western democracies with high birth rates. E.g. France, Ireland, New Zealand, Denmark. The rest is probably due to individualism. Kid…
Capitalism does not tell us we should live our best life. I think there are strong arguments that capitalism (particularly concentrated private investment in housing) causes low birth rates, but I don’t think capitalism itself causes some kind of consumption-fueled decadence causing us to prioritize fun over children.
Apparently (I can't find the source for this, but it stuck in my mind), faced with a glut of production after WW2, the US could either consume more, or work less. The choice was made to consume more, not least because the industrialists could cream off a larger slice of the pie that way.