Quote Originally Posted by Kalise View Post
About the same time where the Echo stops being this rare and unique thing and
The Echo was never all that rare, and certainly not unique. Minfilia started her organization (back in 1.x) to gather people who had the Echo and to study it.
When we first visit the Waking Sands it is very likely that several of the people there have the Echo, even though only two of them (Minfilia and Arenvald) are confirmed as having it.