It's possible. What happens if one or more states housing an NFL team bans mass gatherings until a vaccine is developed - or simply bans them until the end of calendar 2020? Will the state permit that NFL team to participate in what would be only away games. And would the NFL only operate with teams that are in states that allow gatherings? I tend to think that if even one state does not allow play, the NFL itself will ultimately cancel the season.
Yes, the NFL would allow teams to essentially have road games only. See Giants @ Saints played in Meadowlands post Katrina.
Odds are if any state would ban playing a game in front of TV only, then we are in a situation where the other states are allowing in front of TV only.
So hypothetically if Florida and Arizona is allowing in front of TV but Mass, NY and NJ completely ban the games you could have Bills at NE played in Tampa.
I could also see a situation where Florida is allowing people in the stadium and NY is not, but NY is allowing TV only games. Then the question for the NFL becomes play Mia @ Bills in Buffalo in front of TV and forgo ticket revenue or move it to Miami and sell the tickets to Dolphin fans. (This would be a horrible idea as it would result in thousands of people flying from NY to Florida to watch the game)
I don’t see NY being on lock down to the point of not allowing the game in front of TV only but other states allowing gatherings of tens of thousands of people.