I listened to Joe Rogan's podcast with Michael Osterholm and he gave an interesting perspective. He said that most nurses who have children will suffer if kids have to be sent home. They most likely don't have people that can help take care of their children while they are supporting the influx of patients. Moreover, many children rely on school provided meals so sending them home will be very tough on the families.
Don't remember where I read, but some district or something has proposed (or implemented) an option where kids are able to get lunch/breakfast and take it with them without needing to attend school.
It does not solve the nurse issue, which perhaps as a community we need to solve. Perhaps limited opening of school monitored by younger healthier teachers/PTA reps.
Only vaguely relevant, but the school district I grew up in had a policy of never closing for weather. The rationale was that if the school were closed and some children showed up anyway (didn't get the message or whatever), they would literally freeze to death. So, no matter how bad things were, there would be someone there to unlock the doors.