The man's family says "no". It should be left to that. If he has a Will, fine, then the rest is irrelevant.
At what point would you say the facts trump the family?
Do we have to wait for decay to set in?
Heart machine, ventilator, feeding tube relaced by IV nutrition, ulcers putrifying .... where is the irrevocable end?
This man already has a venilator and ulcers which are only kept from putrifying by painful procedures. His body is contracted.
When would you stop?