I think you need a Plan B in case (likely in my experience) he does not follow through calling Rehab?He got up to go to work and agreed he would call rehab afterwards.
This is the way of the world.He was going to do what he wants
Until he wants it, to stop, he will keep doing it. Irregardless of the consequences or what you say or do.
The only thing you can do, as I see it, is to NOT offer him the safe haven or support so he can do this conveniently and comfortably in your home.
You have pointed him in the direction of ALL that he needs to make this right: work, NA, Rehab. You need to prepare yourself for the next step. Which is centered in you and which is the hardest thing of all. Detachment.
He has his manifesto: It's my body and I'll do what I want with it.
He's right. What in the world can we do?
I am in the same spot. Just different particulars. The only recourse we have is acceptance and to begin to center recovery in ourselves. This is what this site is about. How to learn to do those two things. Acceptance and letting go. And recovering ourselves.