This is too big a purpose for people to take seriously, too obvious, too important, too realistic, too demanding. Thus we people prefer to save the whale, or the rainforest, or the poor and starving, or the football premiership title. All such activities are capital entertainment and keep the ego sated; but the mere thought "survival of the species" makes severe inroads into one's happiness and therefore cannot be tolerated.
The only time people so much as mention the species is when they try to justify their greed for sex - by arguing that they overcrowd this small planet with children "for the survival of the species."
Yet it would be too much for these jackasses to ever consider the true value of human life, far too embarrassing for them, because all along they have given more value to the life of their pet dog than the entire human species.