Bus was awful. Kids had no respect for the driver or other kids. Plus it easily tripled the commute time.
If I drove them (or when they were old enough to drive on their own), they could sleep nearly an hour later than if they had to take the bus. Since it wasn't much of a detour on my way to work, that's what I did.
I spent most of my school aged years in an city with a mediocre transit system. Most parents did not drive their kids to school except in very bad weather. Also, most people attended the school closest to their home. This meant the mediocre transit system used buses for special school routes usable only by students. I rarely took this bus as I preferred to bike or walk in about the same amount of time the bus would take.
Where I live now, something similar happens at least for the kids that are bussed across town to achieve a somewhat consistent racial mix in all schools.
Has everyone driving their kids to school eroded the viability of walking, biking, or taking a school bus?
Exactly. Similar to the problem many adults have trying to get to work by bus, it often doubles or triples a commute time.