GG, It's not horrible to say that you need to move on. The forum is about trying to save marriages, but not all marriages can be saved. You are the only one that can determine if and when you are ready to move on. You shouldn't sit around waiting on him, but you can move on w/your life and leave the door ajar. DBing is actually a tool for you. It is here to assist you while you are navigating limbo land. DBing is a tool that you can use any time, any place in your life.
I understand what you are saying and how you are feeling...I was there once and I could have written what you have posted. In fact, I openned the cage door and shoved my xh out into the cruel world. I have been divorced for a little more than 10 years. My xh remains stuck to this very day and is still acting like a teenager.
You can't do anything or say anything to pull him out of MLC. MLC has to run its course completely in order for him to grow up and become a mature adult. Some will come through and be the same or better, others will come through completely different and not someone you want to be with and others will remain stuck. Had you pulled him out of his MLC, he would have re-entered MLC at a later time and it would have been far worse than it is now.
The best advice that I can give you is to do what is right for you. If he should ever wake up and coming looking for you to try to reconcile, then you can make the decision as to whether you want to try again or not. Life is far too short and you need to live it to the fullest.
We are here to support you no matter what you decide. You'll still need support while going through the divorce process.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.