I'm sorry, WHAT?
I need to mull this over, but if Hydaelyn and Zodiark are allegedly the "eldest of primals" ... Hm.
Knee-jerk first impression, I'm hoping it's true in a way that doesn't change much practically speaking. When we see the insides of a primal, it's a spiritual aether crystal core with veins spreading throughout a corporeal shell in the form of what it's believed to be, yes?
What if that is our home? Hydaelyn is a primal-like core under a corporeal shell that makes up our planet and the Lifestream are the veins.
With regard to the world we know, love, and fought for, changing that at all seems ... ill-advised.