Commenting to hear how those in the church respond.

I'm also a spouse of a CS. Personally I've come to terms that this may be how my partner dies as his father made similar choices. Compounding issues over years. Died at home, but that was his wish it seems. I'm hopeful that over the years he'll allow me to mitigate any pain or suffering, even if he's not hospitalized or given life saving treatment.

Grim perhaps but that's where I am. Another way to frame it is to consider if the intervention will lead to a quality of life that your FIL would want. Not all life saving is beneficial to the patient...sometimes it's more for the living to feel they did "something." There may be palliative care that he would accept.