Not factored into this is the rate at which we will have pandemics, going forward. People look back and think, "well, 1918, and now this, so we should be good for 100 years." Unfortunately, our incursions into nature will be most likely cause pandemics to be a much more common experience.
The big question is, of course, what have we learned from this that will allow us to do it better next time? If we can improve the response, and continue to get lucky with viruses that are relatively low lethality, the NFL might be able to spread this business interruption out over 6 years before having to do it again.
But I'm not optimistic about either our collective capacity and commitment to learning and adapting, nor to the next virus being relatively low impact like this one. That's in part due to the unusual and novel characteristics of this virus with regards to how it interacts with its hosts.