The NFL's shift to a 17-game regular season has made an undefeated campaign extraordinarily difficult, with no team finishing better than 15-2 since the expansion and none achieving even 16-1. League-wide parity, grueling strength-of-schedule matchups for contenders, and the constant risk of injuries to key players such as quarterbacks further suppress the odds of any squad navigating a full slate without a loss. Historical precedent reinforces this view, as only the 1972 Dolphins and 2007 Patriots completed shorter undefeated regular seasons. Trader consensus at 92% on "No" aligns with expert assessments that every roster, including projected leaders like the Eagles or Lions, will encounter at least one defeat amid competitive divisional and conference play.