No 2x4s. You did what you felt was necessary and now it's time to move forward. In regards to the kids, perhaps your h remains a good dad. Who knows? I do know that it's not your job to facilitate that relationship. I wouldn't bother reiterating that you want him to be a good dad again. I know it's horrible to see your kids suffer, but your job is not to protect your h. Please remember that actions have consequences. And your h must own all that goes with his.
I know this is easier said than done, however I encourage you not to focus on whether you and h remain friends. Honestly, all you can do is control you and be pleasant. It really is his journey to walk....and all that goes with it.
Be kind to yourself.
3 kids BD 12/15/13 (IDKIILY. ) Rope dropped Cirque du Soleil style D final 9-9-14 "Some people are born on 3rd base and go through life thinking they hit a triple." Barry Switzer