Franchises change. Including owners and senior executives.
Need some evidence? The Jaguars, Panthers, Texans and probably Lions are playoff teams this year. Go back just a couple of years and those were looked at at the worst franchises in the NFL, not just on the field, but in management.
Now I understand that the Jets and Cleveland are kind of a special level of mismanagement, but the Lions used to be thought of as the worst case example, and so the Jets can change too.