Situational question
Being in a vegetative state or in a comatose state entails a lot of financial, physical and emotional sacrifices for the families of the patient.
Given the fact that someone close to you or you yourself is in a comatose state, will you allow for the "pulling of the plug" or will you fight for your life?
I will accept the thing you accurately called "pulling of the plug". There is some situations when it's a best choice. At least half of comatose patients are staying alive only cause of their relatives's will, just because their relatives hiding in the cold shadow of illusion their lover/father/mother/son etc. are still alive. If there is no chance to survive in other way it's a crime to force people living like a "vegetable" state. Shame on you, people !
But if there is a chance, even the smallest one, that the patient can survive, can move back to normal state, then you shouldn't stop trying and believing. But only in that case.