This is good. Better to let people go out on their own terms rather than needlessly suffer for six months. Look what happened Robin Williams. He knew he wasn’t coming back and hanged himself. Better to be able to do it a controlled medical setting rather than risk something going wrong.
Would this cover people with dementia though? You can live a long time with that.
The law requires someone to be certified by multiple positions as being of sound mind. Clearly dementia sufferers could not make this decision.
I suppose theoretically if want were to be given a prognosis of rapidly advancing Alzheimer's or the like, I'm not sure if one could qualify under the statute. Personally, (save the obvious jokes, please), if I knew my brain was deteriorating turn into a semi-sentient lump for the next several years to a decade or more, I might very well want to end things. I wouldn't want my family to be economically taxed how to keep me alive were standard of life is literally not worth living in my view.