I asked the same thing once I got here and realized the magnitude of the problem of alcoholism in my household.
My definition of success has changed substantially now that I am out of the situation.
I think we have to change our mindset from feeling like the success of the family has to mean 'the alcoholic recovers', to one of 'the family will be happy and healthy NO MATTER WHAT.' We already understand that means life without an active alcoholic in the picture..... Our downfall in this line of thinking is that if we wait long enough, they MIGHT get better when the fact is, we do not have to live with it TODAY.