AI is probably the greatest existential threat to humanity.
It is coming. It is going to be weaponized. And it is going to be able to outperform humans at nearly everything.
Elon Musk is right. And though sci-fi stores like Terminator and The Matix contain a lot of outlandish ideas, the core idea of runaway AI is a very real threat.
It goes before the Terminator movies. Colossus - The Forbin Project.