I would love this to happen,
I am another mum who shovels food into her kids and sends them to bed thanks for that comment
My dc do a range of activitys beavers, cubs, judo and gymnastics, they also play with their friends. Being picked up later doesn't need to change this it could be ran more in school.
My dc love school but the school has no spaces at all after school and my dc have to go to a CM who has a horrible daughter that my daughter complains about constantly with her bullying (and I don't throw that term around lightly). I would love to be able to pick them up from school instead of having to have them looked after in a way I'm not happy with.
I don't see why the school can't incorporate art, music, clubs and all the after school clubs they have anyway into something accessible for all. For instance my ds can't do the football club as it finishes at half 4, I don't finish work till half four but if it was a half 5 or 6 o'clock finish for all he could do football and homework, hopefully have dinner and be ready for me to collect at 6.
I then could just go home and spend a quality 2 hours with them instead of being tired pissed off and still having to cook dinner and sort their homework out.
I'm sure most of the mums against this is because their rich banker/lawyer husbands will want to know why they can't get a job and pull their financial weight with no dc till 6.