Wow! Food for thought. I'm 20 years behind you. I think our marriage is salvageable, I need to work on getting my husband out before I could even contemplate giving up on him.
I was talking to a friend in the org last night, she's about 15 years ahead of me, grown up children and I can see in her face she's playing the same game as me. Waiting for something....parents dying....a tipping point. I'm sure years can pass that way.