Yes. Because of the phenomenon of birth control. People tend to choose to reproduce only in stable committed relationships. Fewer and fewer people are getting married, fewer and fewer marriages are lasting because the quality of their partners has decreased, and relationships are more disposable.

There are other factors at play there as well, but it seems very clear to me that the struggle people have in finding a permanent committed relationship is definitely influencing their choice to reproduce. I know many people who desire relationship and family but are still alone and either alone or cycling through partners and struggling with a sense of despair.