As LTD stated, the biggest threat has already been made - leaving if he doesn't stop. Discussing missing alcohol, getting counseling, etc. says that threat meant nothing and all future threats will mean nothing, too. I remember how I felt when I knew I had to take action to have the life I wanted. It's difficult, painful, with no guarantees. Each and every single person has to choose what life they want.
Good luck with whatever you decide and keep posting - it helps.