The usefulness of daylight saving very much depends on your latitude. In the winter in the north of Scotland you'd have children walking to school on the pitch black without daylight saving time.
I've heard that argument before, but really if it's an issue, just change the school hours. I had to get up and go to school in the dark as a child and really, I was so sleepy the first few classes they were wasted on me anyways.
I live in Belgium (so South of Scotland) and with ST and a 8:30-15:30 schedule the sun has set by the time kids get to their first extracurricular activity (16:30).
As for getting to school, do not worry because kids still get there at night regardless and the sun rises just as the kids get forced inside the classroom underneath the neon lights.
The further North you go the more people pine for permanent DST because it's our only chance at getting a bit of winter sunlight during our free time (the rush from bed to school/work doesn't count IMO) and of not wasting summer sunlight at 4 am that is much better used for the 10 pm BBQ.
It'd be GRAND if we got rid of DST and all work/school institutions collectively decided to start an hour earlier in the summer instead. But that's just DST with extra steps, and we know institutions are anything but flexible so it will never happen.
Permanent ST is my own personal hell. If that ever happens I genuinely think I will go freelance and become a hermit.
I recall reading that in the states the public (official) reasoning was for school children and farming but in reality it was commercial interests that actually linked for the change so there'd be more daylight for shopping after work hours