Nature of the Sound

[Vyrerus]

This was the entire impetus for the summoning of Hydaelyn, because the dissenters went "no, this is not acceptable, we cannot cling onto our civilization at the cost of everything else".

No, the impetus for Hydaelyn's creation was specifically their fear of Zodiark's power going unchecked. It's pretty clear that fear was the motivator, because summoning a god that would need to be maintained in much the same way as the one it holds in check is clearly not a real solution, but it was the one they could think to muster that would work, at the time.