We know in history that great individuals have totally changed everything, whether it be Jesus Christ or Abraham Lincoln or Winston Churchill or Albert Einstein. I actually think every person can make a difference.
The observer and the universe are part of the same universe. It's what science discovered at the beginning of this century, when they say you can't tell where an atomic particle is. You know where they are, but not their speed; or you know their speed but not their place, because it depends on you. The one who describes is part of the description.