The problem isn't so much about their risk, it's the vulnerable who could be exposed to them. That being said, per the article I previously posted it appears that some of these "healthy" kids could be coming down with myocarditis as a result of the virus. Certainly no easy answers.
Spring isn't a great option either per Urban Meyer-
https://sports.yahoo.com/urban-meyer-no-chance-spring-222112075.html