why is the cast of the Scions so...elvish now.

[Raven2014]

Except for the WoL, there is not a single Viera, Au Ra or Hrothgar within the Scions. No new race made it as a new member of the Scions. Basically, Elezen are leading the Scions with the most members in it.

Which made sense, it's originally an organization focusing on Eozea, so only the Eozean races are in it. While it had seen expanded the scope, there is another hard requirement that makes the new races unfit for it: you have to not holding allegiance to be a scion. The reason the scion can meditate between states because they don't represent any one in particular. Even though it was a disaster, that was the reason why they moved their HQ to Revenant toll to begin with.

While we had run into many prominent members of the new race, all of them still hold a solid allegiance to their original states, making them unfit for the Scion cause. Heck, that's why Lyse had to step down once she decided to become one of the leader of Ala Migho, and Estinien only invited to join once he went solo and no longer duty-bounded to Isghard.

I think we'll see new member eventually, but frankly Estinien and Tia raised the bar quite damn high for joining (at least for the main group). It will have to be a character that must have been around for a while and well known to the player. I doubt we will see new Scion helicoptered in out of nowhere.