Think phasing in WoW. And the tech may come to FFXIV which would allow phasing zones from different servers together in low pop areas (on the same data center obviously.) Possibly only applicable to town areas which could, for example, put all the folks that have unlocked 2nd Coil into a different phase of Fallgourd Float than those that have not. This would illeviate the stress on the area surrounding the aetheryte without hampering the remainder of the zone.