I would like us to loose. Loose real bad.
N’Zoth either tricks us and he frees himself or Xal’atath does the trick and we give her more power. In the end the BFA war still rages on. but we must now break away from the war in a small elite force under Magni and head underground to save Azeroth from the old god corruption we allowed.
We get a underground cavern like xpac. Azol’Nerub themed maybe? Since Azerite has been a bust. Change the progression like system similar to the artifact system to something light or dark themed. Pick and item … ring, cloak… etc and attached it to your chose of light or dark. And add these choices with flavor to the look of your spells. Example would be a shaman choosing the dark. There spells have a shadow themed casting effects. Dark Rangers, Vodoo shamans, and Dark priests abound.
I would also add a Shadow themed Priest healing class. 4th spec? But i think you all get the idea.