In 1981, the Baltimore Colts set the NFL record for allowing 533 points in a 16 game season, an average of 33.3 points per game allowed.
The 1966 NY Giants allowed 430 points in a 14 game schedule, averaging 35.8 points per game allowed.
Through 7 games, the Bills have allowed 227 points, averaging 32.43 points per game allowed. Projecting this over 16 games, this comes out to 519 points allowed for the season.
In short, this means that this years team could have one of the worst defenses IN THE HISTORY OF THE NFL. Ouch.