I am completely uncertain wether magic consumes aether or not, actually.
As far as I am aware, it does not rightfully consumes it, exception being to White and Black. Further actually, as I said exception being to White and Black who have in fact brought a calaclysm of their own forth, none of the arcane arts seem to grant you access to any more aether than you are either given or born with.

Thaumaturgy uses your own, no pilfering from others no taking it from the land or anything, if you do run out and kill yourself, it was only your own aether, which in turn is not really lost, the aether of all things is returne to the land at death, even that of primals.
Conjury you directly ASK the land for it's power, you are definitely not ever given more than it deems safe to grant you. I hardly doubt that hydaelyn is suicidal about that.
Arcanima is an art based on binding the aether for effect, and later letting it dissipate again. No effect is long-lasting and no aether is eternally trapped.

Unlike with primals, who hoard more and more aether to remain alive, and who would ultimately dry up the land to remain existing, unlike every other living being who contains aether, but needs not bigger quantities by the day, they simply contain that which they were born with. Pureblood garleans are no more or less good than others, regardless, as they too consume aether with their science. What do you think their fuel, ceruleum, us?