Well, if he keeps up at that pace, my guess is he won't be with us too much longer.
My now XAH had nearly gotten to that point. His life narrowed so. He refused to stop. There were times I'd find him passed out on the bed, clutching his bottle. And at times, I even toyed with the idea of just pouring the remainder down his throat and being done with it. When you get to that point (both the user and the witness) it's time to act. I opted to divorce him. It was that or drown him.