Yeap. And that's of course why it's called triage, instead of diage (or would it be biage?). People are divided into three groups: those who will get well without help, those who will die even with help, and those who will die unless they get help.

I'm not sure where you heard this, but triage does not use the prefix tri- meaning three. Triage is a concept that is instantiated differently per locale and is not a universal 3 bucket system.