Have a look at the alcoholism and newcomers forums, there are lots of stories of people who have overcome alcoholism and gone on to live productive and happy lives.
Two that come to mind are tomsteve and lessgravity
https://www.soberrecovery.com/forums...archid=8578976 (tomsteve's threads)
https://www.soberrecovery.com/forums...archid=8578974 (less gravity's threads)
I'm sure it happens all the time, it can be done but it takes a REAL commitment, the person has to want it so badly they are willing to go to any length to get it.
Think about changing something about yourself, for instance. Say you want to change from being codependent. How easy is that? Where do you start? It is probably the way you have always been? What is your first step today to change that. We can point you in the right direction, many here have, but you have to want it.
It's not easy. As you say, you are struggling. You can see it here. Can he be helped? He can absolutely be helped when HE chooses the help, no amount of presenting him with hope or tools is going to change that.
If your love could change him it would already have done so. You have been right there beside him for years, what change have you seen?