To be honest, I half expected him to have been completely erased at first. The spell he cast at the cost of his life seemed like the kind of thing that would also consume the soul's aether. To later encounter him in the aetherial sea was a neat little surprise. He may not get brought back, but I have a hard time thinking SE will never use him again. Even if it's only in image or memory, he's bound to make an appearance somewhere down the line.