Exactly. It has been heavily implied that Hydaelyn is "dead". Or, at the very least, she has gone silent and no longer speaks to her "children". The meteor shower may have been a "birth" event of sorts, with Hydaelyn seeding the land with as many possible Echo-users as possible.
Over time, some have gone astray. Others have died. And today, only two are officially known to remain.
Three, if we count Iceheart as well.
P/S: For some reason, I'm suddenly reminded of salmon. The fries that became the users of the Echo fought the circumstances of their time, seeking eventually to return "home". And now, only the two strongest remain.
