The problem that isn't being considered is the same as people who say "I don't care if I die from a stroke (or heart attack)". It doesn't take into account that

The problem that isn't being considered is the same as people who say "I don't care if I die from a stroke (or heart attack)". It doesn't take into account that you might get either issue and not die but be incapacitated. Consequently anything that relies on a reply to determine if someone is still alive (even with notifying relatives) simply isn't going to end up solving the problem.