Re: I dont fancy this
My kids had a "Do Not Resuscitate" notice on my ex wife after she suffered severe brain damage in a stroke after a brain operation. Whether it is still valid I do not know but it was a very hard choice for them to make collectively.
I don't see the problem with it, there are end of life plans that you can sign while still in control of your faculties that will be followed when you are not in control.
When things get overwhelmed in ICU someone has to triage the patients and decide who will get treatment and who won't. These forms make the job easier and remove life and death decisions from someone else.