I'd start 'em off with a line from a little-known Grant Lee Buffalo song:
Oh it kills me to think
That I'm no longer living, just looking for excuses to drink...
And then tell them there are a lot of people out there who would be more than glad to get you to start living again. But they can't do squat until the choice is made by the person in question to want to live. Because addiction is, at the end of the day, a slow suicide.
I agree that there are may people that are ready to help. And that it is super-important that anyone wanting to quit get real live PEOPLE living in the real world involved in helping them.
This cannot be solved just communicating with people over the Internet. It is jsut too easy to start lying to yourself and your cyber-friends. You need to look people in the eye and connect, we can only help with encouragement over the Internet.
Pretty much sums it up... and cirrhosis is a slow, humiliating way to end it all.