Most stadium deals NFL teams have made over the past decade gives the team revenue from all events in the stadium instead just the NFL games. Owners who have been able to get cities and states to agree to these deals can insert other events on the days the team would have played should the sport collapse. The team as a legal entity would live on as an entertainment services provider. Even if the replacement event isn't as popular as the NFL once was, it along with all the other events hosted at the stadium likely would keep a profit stream flowing to the team owner.