You know T, you and I share several things in common... one is W's that are quite comfortable in our homes, and not making any moves to leave.
My thoughts, for what it's worth. (about 2 cents): We have more power and control than we realize. We don't have to STFU forever.
I'm not going to be afraid to say/ask what I feel. It would be hard for me, and I believe you, to do or say anything that ended the M, or made our W's move out. Maybe it's time for something new.
M: A really long time. Crisis: 5 years. She's still worth it.
Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl