As is usually the case, the folks who have a "one saved life is worth it" belief do not weigh the risk at hand against the risks on the opposite side. I can assure you that the vast majority of teachers want to be back, including those in the 55-70+ age range. I'm sure most districts will accommodate those teachers who want to teach from home. It is relatively easy to have students in school, watching a big screen, as the teacher teaches from home. Plus, you can have a para/aide in the room to keep the kids more on task than when they're on their own at home.
That said, the logistics of in-school instruction are enormous and I just can't see it working in most districts. You're relying on kids to be disciplined about keeping the masks on and not herding together. I just can't see that, at least in bigger schools. Many have parents who aren't wearing masks, already. You will have kids who deliberately cough or sneeze at each other or without covering. I can foresee multiple outbreaks in many schools, which will then have to close for periods of time. How many times will these districts go virtual and then come back? I think about my previous district, specifically the middle school, where they had to pay teachers $4000 extra to take lunch duty because no one wanted to do it due to student behavior. As a colleague stated, "You'd rather have your head dunked in a toilet full of crap than have lunch duty here." How is this going to work in that environment, which isn't atypical?