That's why I can't see the NCAA cancelling fall sports. Only way that happens is if society as we know it has fully collapsed. At that point, college athletics would be way down towards the bottom on a list of things to worry about. I'm no expert on COVID-19, but I doubt we get to that point.
Hopefully things will be cooled down by then. But there are plenty of teleconferences going on right now that are discussing the possibility of no or limited fall sports. They've already postponed the Olympics for a year. The Olympics basically overlap your football training camp season, so it's not a stretch at all that we don't have fall sports. If we do have them, they may play in empty gyms and stadiums.