DA and PC

I don't know why people are blaming PC. All this is on DA. He was bad as a Raiders' coach. And his OC at the time was just as bad. He controls his OC and what needed to put out when it comes to pay calling.
Oh, he's not free of blame, PC is there because DA wants him there doing what he is doing! DA is not coaching to win the game, he's doing his best not to lose the game and this passive offense fits that philosophy. They are content to take what opposing defenses give them instead of attacking defenses because it has work for the Saints in the past with an older Brees.

Brees was able to keep the chains moving and he was able to turn a 50yd TD drive into 15 play 5 minute drive in his later years. Even then, it became harder and harder to execute and score, especially in the playoffs. Each drive had to be perfect and every pass was heavily contested.

These guys aren't capable of doing that so it's time to change what they are doing on offense. Taking what they give you shouldn't be your primary goal, you need the D to react to your aggressiveness.