Assuming better defensive health is fair. But so is assuming less good fortune in terms of offensive health, which is worrisome because of the Vikings' lack of quality depth at wide receiver, offensive line and quarterback.
On the NFL: Every year since 1990, at least four teams have made the playoffs that didn't the year before. And the Vikings are a model for postseason inconsistency.
In short, the Vikings might go into next season betting they can return to the playoffs simply with a better-executed version of the approach they took in 2020.