I look forward to the day a majority of people realize that our biology is, to a large extent, something to be overcome. Our "natural" biological impulses are often incredibly destructive, for both ourselves (e.g. sugar cravings) and for those around us (e.g. the impulses in this article).
Tribalism is easily the most destructive of our impulses, especially in the way in which it can interact with ideology. Through ideology, such tribal impulses can camouflage their own effects and short circuit the "better angels of our nature" to excuse the dehumanization end even the slaughter of the out group.
I think that's the last great barrier to humans finally "waking up from history."
In particular, the way tribalism and in-group/out-group psychology interposes itself into political discussions is especially pernicious -- especially in the ways it manifests over the internet in social media. Fear isn't the mind killer. It's ideology combined with tribalism! If humankind ever destroys itself, in all likelihood, some group will have ideologically convinced itself that it should do so for some incredibly noble reasons.