You can cancel HS or college or do online or whatever you want but you are not stopping HS students and college students from congregating. So the PROFESSIONALS need to find a way to do school. The kids are already developing ways to beat the you have to wear a mask thing. I listened to a group of girls the other night name which teachers would uphold it and which would care less.
A discussion somewhere else on the internet was what would you do with teachers who refuse to come back to the live classroom. Would that be grounds for termination? Not showing up for work.