"Based on year-over-year rates for the first academic quarter, she said, the number of students who failed classes had increased in every grade and every student group. In middle and high school, Santelises said, the percentage of students failing a course rose to 60%, up from 38% in 2019."

https://www.baltimoresun.com/education/bs-md-santelises-reopening-20210112-47aqnvc47nekximlrmr53j3viu-story.html This is just Baltimore. And there is no evidence that schools are major outbreak drivers. If positivity is low enough no reason hybrid learning cannot be an option for those who opt for it.