I too felt the same way when My A quit drinking. I was very uncomfortable with his "white knuckling it" approach to not drinking. I felt that being in some kind of program would help him deal with his drinking, and perhaps the many underlying issues.
I have since realized that it is not my choice to make. He must make it on his own, because if he doesn't there will most definitely be resentment and relapse. This I have experienced first hand.
This is near the top of my list of boundaries. Maybe I will share it with him, maybe I will just walk away. Can't say anything for sure right now.
Good luck and keep posting, it really does help. Knowledge is power.
Oops, I forgot to add that it was my own individual choice to not have or consume alcohol in the home. It was solely out of respect. Heck, I didn't even go out and have a few drinks for months. It was only many months later that I felt comfortable enough doing so. It was my choice.