I think the problem is the NFL had the longest of any sporting organisation to figure out how to get through the season but has stubbornly stuck to the line of "business as usual" the whole time - there was nothing preventing them from adding in an extra bye week (or 2) at the end of the year to play postponed games or even have a bye week every 4 weeks where catch-up games could be played
they put in a ton of schedule flexibilities so that they could postpone entire slates of games and still have the ability to catchup at the end of the year without too many schedule clashes but they've refused to actually adjust
they adjusted roster rules but not really anything else - they had so much time to look at other leagues and see where they've succeeded/failed and they didnt put in contingency plans so now there's no leeway left in the schedule and all they've done is added in the potential for an 8th seed in the playoffs if not all the games get played which is like the worst of all worlds
Well, in defense, the 8th playoff team is, by definition, a contingency, and they have a week 18 baked into the schedule already (and have for many years now). They just push the playoffs back one week and eliminate the week between the Conference Championship games and the SB, which never really had much meaning to begin with and was the deadest of dead periods in the sports calendar.
Plus as we saw earlier, they had built in capability earlier in the season to shift around bye weeks and schedules to make games easier to play. I think they always knew that wasn't realistic once you get into the mid-point of the season, but they also made it extremely far along without any significant issues to begin with.
Realistically, a one team "outbreak" is really kind of trivial. Like the NFL is perfectly content with that. The only thing that they have to avoid is multi-team, multi-game shifts over a multi-week period, or a multi-week outbreak on the same team that requires multiple game postponements across multiple weeks (i.e. Ravens have to postpone 2-3 games in a row because they can't get things under control).
Outside of that, if you're not in a bubble, there really aren't many other versions.