Much like in chapter 3, Ezekiel is told those who know of coming destruction are obligated to warn people. He is also told it is the end of the story that matters most. If a person starts out righteous and turns bad, the person is judged as unrighteous. If a person starts out wicked and turns good, the person is judged as righteous.
It is never too late to warn someone you know to turn to God!