I won't argue with statistics, but the people I see IRL are still having children, and not worrying about whether they can afford them or not. A friend is going to be a great-grandmother, her 21 year old unmarried, jobless, granddaughter is giving birth next month. I see more on my community social media pages, single moms (and couples ) with multiple children asking for handouts because their government assistance isn't coming till next week. Some even continue to have another one so they can get more assistance and not have to work.the core reason people are not having children is because It's no longer affordable
In the context of this thread, it is also true that for some people, not having children (fruit) or not starting a family is equivalent to pruning the tree so that (the soul) can grow stronger. Pruning represents a necessary cleansing (through the word) to remove what hinders spiritual growth. A process of purification or discipline that removes obstacles (sin, distractions) to foster greater spiritual productivity.
I never wanted children, perhaps because I did not have a close relationship with my parents and didn't get the "good feels" that I wanted to pass on to having my own. But there can be the opposite effect in "I want to have a child so I can give it everything I didn't get." I now feel like my decision was a "pruning of the tree" so I didn't pass on the issues I have from my dysfunctional family into another generation.
The people I know/meet with children (now it's grandchildren in this stage of life) are so preoccupied with family life (babysitting, attending their sports games, etc.) that they don't have any time or inclination to pursue "spiritual growth" other than (maybe) a quick trip to church on Sunday.
Yes, it's possible to have children and spiritual growth, but I believe it's more difficult and takes real commitment, not to mention the inner drive to pursue that path. I'm not sure that if I had children, raising them would not have distracted me from ever getting farther than the quick trip to church on Sunday.