It's easy to make such a decision when you're fit and well but you don't know how you'd feel if push came to shove. One of my brothers broke his back and was in a spinal ward for 2 years. He's paralysed from the waist down. At the time of his accident he said he didn't want to live life in a wheelchair and wanted to die. Eight years on he still wishes he had died. In the same spinal ward was a teenage boy who was paralysed from the neck down, similar to Christopher Reeves. He wanted to live at any price and although he can't move a muscle he has a better attitude to life than my brother. Also, I have an auntie who has been on dialysis for 12 years. She is a believer in life at any price. Over the years she's seen quite a few people with kidney failure who have refused dialysis and died as they didn't want to spend 3 days a week hooked up to a machine.
I've always said I'd want someone to pull the plug on me or stick a pillow over my face if I turned into a drooler.