WOW. I bet that has been a heavy load. I hope sharing here has helped and people more experienced than me will offer advice/comments.
I am glad you have an IC in your corner. As you have been debating this yourself I suppose it is not the case but I hope it is coming from you and not IC. You phrasing comes across as you feeling obliged to do this and not that you have chosen.
In the end of the day every LBS will be forced to decide when enough is enough. This is especially true IMO where the couple still live in an unfulfilling M. When S leaves it is easier in s way as the decision was made by WAS. You have fought long and hard for your M. You have shown strength where most would have faltered.You are not deciding to end your M you are deciding to no longer accept a situation which is not acceptable.
As for if it is right or wrong I cannot advise. You have made great progress since I first read your first, thread. But there was always that hint of it not quite being on track. Only you can really read the full situation.I will just say that it does not strike me as a mad thing to do and if I had to vote I would vote yes, do set your boundary.
When are you thinking of acting on this?
Best of luck.
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together