I am for you to have to be in the situation.
I volunteered for a long time with a great recovery concept based on CBT/REBT/motivational interviewing techniques as an alternative to AA/Al Anon and they also use what is called CRAFT for concerned significant others. There is alot of work on setting appropriate boundaries and being prepared to follow through with what you say etc, rather than setting ulimatums which in effect are de-motivating for the person at the recieving end. I can sound a bit poncy - but using 'i' statements instead of 'you' statements can make the world of difference -
I feel angry and scared and let down when you drink when you said you wouldnt. I dont like feeling that way. If you choose to carry on drinking, i dont want to be around you and i will make plans to take some time away.
This is just an example, and it can be much more effective than -
If you dont stop drinking, i am leaving.
It also puts your emotional responses back in your control - which can be scary too.
You can hate the behaviour, but still love the person doing it. One of the very first 'swings' in changing an addictive behaviour is for the person to see a change in motivations themselves - drinking is Giving your husband something very beneficial (in his view) at the moment - the balance will tip when the motivation to stop outweighs the motivations to carry on.
I am sorry that you are going through this, but he actually doesnt need to stop drinking - he can and will carry on as long as he likes/is able. There will be a time when he WANTS to stop. That tipping point. In the meantime, there are lots of things you can to for YOU to protect your own boundaries and life without making absolute demands on his.
Sorry if this is long, but having worked with and been part of a peer support group for those with addictive behaviours, i know that its possible to stop without believing you are diseased/need to rely on something more powerful than yourself. And the same for those loved ones that this affects so hugely.
It sounds like he is the precontemplation Stage of Change - that he doesnt see there is a problem. This is Ordinary and not conscious 'denial'. Stages of Change work is fascinating and it helps those around someone who is addicted to a maladaptive behaviour understand how it feels for them, too.
Please check out this - CRAFT for you and perhaps SMART Recovery for your husband.