Anything is possible, but FWIW, only 6 franchises have ever posted a 15-1 record or better during the regular season. The odds of 3 of them doing it in the same conference in the same year is not something I'm worried about.
The Packers were the last team to win at least 15 games in a regular season, and that was 2011. Before them, the 2007 Patriots. Before them, the 2004 Steelers. So 3 teams in the past decade...3 teams in the same conference same year probably not something to get concerned about.