Long long ago, when the stupid Titans ripped Ya'Shaarj from the surface of Azeroth, we got stuck with this whirling hottub of arcanic lifeblood known as the Well of Eternity. Fast forward some amount of years later, prolonged exposure to the vicinity of the Well evolved the "dark trolls" into what would become the Night Elves, or Kaldorei. And they built a beautiful empire and lived a long time, yada yada.
Fast forward to the ending of the Third War, the destruction of Nordrassil, the tree grown from phials containing water from the Well of Eternity and blessed by the four remaining Dragon Aspects robbed the Night Elves of their immortality.
Now here we are in BFA, at the end of the "Fourth War" with something that's still possibly in quite an abundance: Azerite, the arcanic lifeblood of Azeroth. And this just being, speculation, there may also a last phial containing the waters of the Well of Eternity. Since I don't believe Blizzard has come out and confirmed/denied that Illidan used it prior to this defeat at Karabor.
So, it comes to this. Between a vengeful race that has lost their home...again, the lifeblood of a titan soul, and now multiple titan facilities up and running that can be exploited...I ask you all. Can Azerite be manipulated in some sense to rebirth the Night Elves eternal longevity?