"Back to school" is going to be a bumpy ride. Lots of quarantines and at least temporary shifts back to virtual learning I think.
I feel bad for parents with unvaccinated kids. Yeah, kids tend to get milder illness or even be asymptomatic, but nobody wants their kid to be the one who gets really sick. Something I was thinking about is that elementary school kids tend to be in one, maybe 2 classrooms all day, and nobody in that age group has been able to be vaccinated yet. If someone in the classroom is carrying the virus, that group of kids will have hours to be exposed, potentially taking in a huge viral load. Unlike middle/high school students who move around the school more and at least some of whom have been vaccinated.
A counterargument may be that some schools were open in-person last time without having issues. Yes, but delta is a different animal. It's going to be harder to stop it in schools and there will be a lot more schools in-person this time, at least to start.