I mean if the team sucks in 4 years then I would expect any team (maybe not the Steelers or Bengals but they are weird) to want to rebuild the organization from the top down. 4 years is not even a short leash, its an eternity by NFL standards. It would take multiple awful drafts in a row to lower the quality of the team from what is honestly a pretty high point right now and multiple bad decisions on the level of not signing Mosley (damn it get that deal done).
Giving Eric 4 years is a LOT of rope and more than most GMs would get in a similar situation.