I have to agree with the previous posters.
You might consult an attorney about getting an order for CS during his voluntary absence from his children.
That may lead him to say he's coming home, but it's your decision whether he lives in your house. Once an A is out, I wouldn't let him move back in unless that is what YOU want.
Drinking or not, thought patterns don't change overnight and he sounds very selfish.
Don't worry about your children's long-term prognosis. Just fill their needs for today in a loving, consistent way. All of us who have chidlren with alcoholic spouses worry about them this way, but one good parent is enough, if they're lucky enough to have that. And yours are. ((hugs))