So other people get to decide about the fate of a coma patient? How you know it is voluntary? I don’t see how the capacity argument works if there is no active participation to decision making. If an unborn baby ”wakes” up earlier than a coma patient, I would say that baby has more capacity to decide than that coma patient who let’s say wakes up in 5 years. (The chaotic slippery slope here is that we need to give birth to all potential babies)

Okay. The coma patient has showcased his capacity at some point but what if the rules have changed since and there is no evidence that he agrees with the common train of thought or whatever the given fixed point is.