I have had talks with my A regarding his problem, and he actually has read a ton of books himself on the subject.
I am going to say there's a good chance that the only thing this "talk" will accomplish is to sooth your conscience, because from what I've seen there's a very good chance that an A won't change until he's forced to do so.
Mine is in inpatient rehab, he's always talking about how he's doing it for me, and from what I understand he's convinced the staff that he's not an alcoholic, he was just drinking because one of his medications makes him a nervous wreck, and he just needs to have tranquilizers as well. He can say that all he wants, but the truth of the matter is that he had the tranquilizers before, he still drank, and nothing I ever said to him or did for him stopped that. He didn't even go to rehab until I disappeared and spent a night at work, then changed the locks myself as soon as I got home.
...I guess all I'm trying to say is, do what makes you feel like you did what you had to do, but please don't be hard on yourself if they don't work, because it's not your fault at all.