The NFL knows that there can be no season until there is a cure and / or vaccine, or some miracle to protect everyone from others spit and sweat. Football players (and other sport players) are exchanging saliva and sweat constantly with "droplets" flying all over the place. I would venture to guess that some of those droplets could possibly even take a ride on the wind and make their way into the stands - should they be dumb enough to allow fans in them. Unless the NFL uniform this year is some type of space suit, I see no way the NFL, or any sport operates besides maybe baseball which is non contact with the players spaced far enough apart from each other during play. In all sports, the dugouts, sidelines and locker rooms are all an issue where masks would have to be worn, however, you can't have everyone wearing masks while running around playing a sport LOL. I find masks ultra uncomfortable to just walk around in generally, let alone play high energy sports in. I feel as though I am breathing my own CO2 every time I wear one.
Sorry to be a Debbie downer, but we have to be realistic here. They are keeping office workers home for months, gyms closed for months, barber shops, bars, restaurants, and other businesses closed for months, but they are supposed to allow NFL training camps to operate freely in 90 days during this?