Well the purpose of the public schools is not to act as a free daycare.
I would imagine that if the four day school week became widespread, parents would find it easier to arrange childcare on that 5th day...programs at churches, YMCAs and stuff would start popping up all over the place, employers might start becoming more receptive to parents working a 4 day week or working that 5th day at home, SAHM could take in other kids one day a week for extra money, etc. I think the 4 day school week could be a great way for parents to be able to have more family time with their children. It could be the beginning of a new way of life for our families - more together time, more opportunities to do things in the community like visit museums, play at the park, volunteer, etc. It could be a fabulous opportunity to bring families closer together. And it could be a lot easier on parents to schedule things like dentist appointments, errand day, etc.
Not my post, but why do you think school provide free daycare. Parents around here pay for that. HOw can 4 day school weeks provide more time with the kids if both parents are working? Also day cares don't and won't provide part time care around here. I think this would be a huge problem for working parents.
So that's the guiding factor the state should consider?