Surprised though about Elon's first response to the questions about AI. For a visionary technologist (who's incidentally also positive about human genomics), the fear that he expressed about AI was surprising. Am only half-joking here but, is Elon getting too old to be optimistic about something like AI? Or, did watching Terminator in his formative years scar him for good?!
Maybe he read Harlan Ellison's "I Have No Mouth, and I Must Scream." That's pretty much a worst case scenario for AI.
I feel that the advent of AI is as natural a progression of human "evolution" in much the same way that cloning and genetic engineering are. I remain optimistic that, one day, biological humans can safely and productively coexist with "artificial" intelligence.