Couldn't you just hire several more teachers and staff to switch out certain days subjects/coverage to achieve full 5 day coverage while also cross training people to better fill gaps. Also the education system is mostly just there to turn us all into workers of some sort, so as the regular work week shortens, perhaps the school week should as well. Especially if we're trying to maximize that extra family time.

I think part of the point of a less taxing work week/environment is part of the draw that could bring people back into these sorts of jobs.