Firing DA after one year doesn't set a bad precedent since he was brought in on the basis of continuity. We were a winning team with a winning coaching staff, he failed to carry that on. Loomis should make it clear that the next coaching staff will get a longer leash and be given a few seasons to right the ship.
A failure to fire him after this season would be catastrophic for the franchise. He'll no doubt draft a QB and if he fails next season he'll just blame it on having a rookie QB and Loomis will give him a 3rd year. 3 years of losing will destroy why good will we had with free agents and it's not like New Orleans is all that an attractive of a destination to live anyways.