Yes, continue with your plan. Sounds like there have been plenty of past opportunities for him to get sober and save his family. He continues to choose otherwise. If it all meant that much to him, he would do whatever it takes to find recovery! His decision to just stop drinking is doomed to failure. The A will do whatever it takes in the short term to manipulate you and keep you enmeshed.
Nothing changes if Nothing changes. As long as he continues to get that "one more chance" he will continue on his same old path. He does not have to experience the consequences of his drinking. But you and your children do.
Yes, he will blame you. Yes, he will be the victim here. Quack Quack Quack. Just because he says it, doesn't mean it's true. Try to remain detached from his words and his behaviors, stay focused on doing what is right for you and your kids.
Are you in AlAnon? Go to a few meetings, I think you will find a lot of support for your decisions. SR is great, but AlAnon adds another layer to the support that you need right now.
Doing the right thing isn't always easy. But you know what you want for you and your children. Sending you hugs....