The NFL has not yet had a major disruption to its season due to COVID-19, which is sort of remarkable given that they’ve had to juggle schedules and have had rashes of positives tests all across the NFL. The Falcons had multiple positive tests on the roster and in the staff, and it’s clear that while weeks haven’t been called and the season hasn’t been extended, the league is thinking about those eventualities.
That’s probably why the NFL’s owners have voted unanimously to expand the playoffs to 16 teams...if games are impacted. What that means in practice is that if the league can’t finish the season in their regularly scheduled 17 weeks or an expanded season that spans 18 weeks, they’ll expand the playoffs.