I really think this would be a boring and bad ending. It would be again just luck that our dragon is the ultimate plot device(a magical sponge which is better sponge than all other 6 elder dragons while not becoming corrupted).
I think the storyline right now is pointing towards great mistakes we have made killing the dragons and destroying the balance between them(and I think it's a really nice plot). But if all of this is just to be solved by Aurene eating magic of all other dragons well that would be really disappointing.
I really think the story with replacing each elder dragon is much more intriguing(what beings will replace them, will we find other dragons? kunavang, other ED children, gods, spirits, bring back titans, or maybe don't replace some of them, etc.) and can setup many more future surprises for the universe(replacing dragon with other being which isn't "good" because we have to do it, like deal with Joko in gw1).
I am afraid of this because with the last magazine about Icebrood saga and war eternal there are some suggestion this will happen(prismatic dragon, Kralkatorrik talk with Aurene).