Of course, it's your choice to wait around but please take care of yourself in the meantime. Find things YOU like to do, go to Al Anon meetings if they appeal to you, spend time with friends, etc. I, too, am wondering when my AH will hit bottom, if ever, but I am living my life and taking care of our son the way I need to no matter what AH chooses to do. We need to let the A's in our lives have the dignity to fall flat on their faces and we give them up to a Higher Power to be cared for.
Oh, and please don't blame yourself for his going back to drinking. His life, his choices. I blamed myself for the longest time as my AH didn't touch alcohol for 15 years and I blamed myself. Well, I finally realized that I didn't pour it and I didn't bend his elbow for him. You sound like you know what to do and just need some encouragement. I hope you have a support network of friends and SR is always here when you need them, too!