Mnky, I can tell you with complete certainty, it ain't even over if you end up D.
Right now, I know of at least one WAS who is wanting to reconcile with there D'd LBS of over 4 years.
That's not to say that path is the one that will occur for you. It is only to say that, we can only control us.
There are plenty of examples on this board, currently going on, where this stuff works to save an M and if saving the M does not happen, the LBS finds their peace and becomes a much better person because of it.
The LBS hurts because they haven't detached. Don't fear detaching. It's not easy, but it almost appears to be the corner stone to salvation, if you will. It sounds simple to do, it is counter intuitive, and IMHO... it works... bar none...
As for the cheerleaing... As much as you had a hand at the deterioration of your M, I see greatness and compassion in you that your W would be fool to leave. Work that, my friend... BE that person, find your greatness and your life will be better in so many ways!