Way to go! This is how I'm handling things now too; one baby step at a time. Don't be surprised if blasé turns into a full on war at some point in the future. Right now, he thinks you're just blowing smoke and using scare tactics. I've seen this happen in divorces even when there is no abuse or addiction; the spouse who thought, "Oh she(he)"ll never follow through with it" winds up shocked when it comes down to the actual even and they lash out and make things more difficult.
Hugs to you, you are doing great!!!