Thats the thing. Im glad they not tryna outdue God himself. Just wouldn't make sense. Lets scale down the story a bit and get more personal. The fact Mama Winchester is back is a game changer alone. Remember she was a hunter before their dad was.
Not to mention Sam/Dean have both vowed to "Make the smart choice" From here on out and not risk the world on saving each other. Plus you have billie just waiting on them to slip up so she can reap them and make sure they don't come back. Them winchesters don't have anymore life lines. Making a even bigger threat then God's sister just don't make good sense right now.
Is Mary gonna be the new Bobby?
Is Sam basically going on trial for fukking up the world?(Until Dean and Mama come to the rescue
)
But all in all this was a damn good season and the first time post kripke era that the entire series feels like one long story rather then Season 1-5 feeling like the "Real" story and everything else is a "What if"
Lucifer himself showing Sam(and us the audience) That Amelia was the lowest point of the show was