I too doubt that the talk will change anything. For someone to get better they have to admit they have a problem. This is a huge step and rarely happens as a result of our confronting them.
I have allowed my children to suffer so much at the hands of their mother's disease (and my co-dependency). When I step back and look at things for what they really are, I am stunned at the sh*t that I tolerate. Where are my boundaries?
Good luck. Do what is best for you.