The thing I want more than anything actually is for us to hear the Sound beneath the earth, and it's this
https://www.youtube.com/watch?v=Dfb_n7wjb5k

They could totally make a raid series out of it. Dunno what first tier would be, but second tier could be the Black Omen, and maybe somehow there is another unsundered Ancient who wasn't an ascian and was just biding her time to restore the world in her own way. And then Tier 3 is just every phase of Lavos plus maybe a new phase. Or maybe Lavos turns into Time Devourer for the final boss.

I don't think it's likely, but I don't think I'd seriously ask for anything else for XIV if it happened