> Every suburban parent I am aware of has to juggle the logistics of shuttling children around
From experience, most of that shuttling is done for extracurricular activities the parents want for their children. i.e. music lessons, non-school sport leagues, additional lessons, etc.
Self induced demand.
> And the distances are too large.
What kinds of "too large" are you referencing? I recall biking some 10 miles to get to activities in the summer. Highways, yeah, those are out. But stroads often have shoulders and/or sidewalks (which are largely unused by pedestrians). Not really a problem for biking.