They are already talking about delaying the start of the season to October 15.
I know the players are young and much less vulnerable to the virus than others, but the risk, the legal liability, of such an endeavor is enormous. Even with no fans in the stands, the far left media/press and the Democrats will pounce on a situation where some players or support staff get the virus.
I would bet the NBA and NHL will cancel their seasons, soon.
College football? IMO, almost impossible.
All this changes if a prophylactic pharmacuetical product emerges, SOON. (not referring to a vaccine, that is 18 months away, at least)