Even the simple decline in people who identify their neighbour as a friend can be explained by a lack of women living and socializing in the neighbourhood during the daytime. The increased use of paid childcare would similarly reduce the amount of children living and playing in the neighbourhood during the day.
Overall, this would contribute to the feeling that the suburbs are ghost towns during the day, and families arriving home from school/work would rush inside to eat dinner before chauffeuring the kids to all of their extracurriculars.