I'm of the belief that in such a situation, a pre-cognitive decline "living will" or dead man switch is appropriate.
If I were diagnosed with dementia, I'd build automation to ensure that I'd appear to die a natural death when I enter the steep slope of cognitive decline. It's as easy as tying the results of frequent cognitive tests into a moving average that triggers my medication dispenser to start mixing in a toxin and or substituting key medication that keeps me alive with a sugar pill. These days, without the right medication, I'd be dead from "natural causes" in a week.
If I were diagnosed with dementia, I'd build automation to ensure that I'd appear to die a natural death when I enter the steep slope of cognitive decline. It's as easy as tying the results of frequent cognitive tests into a moving average that triggers my medication dispenser to start mixing in a toxin and or substituting key medication that keeps me alive with a sugar pill. These days, without the right medication, I'd be dead from "natural causes" in a week.