When I hear about Hawking or Musk etc. being feared of AI, I always think about how cats & dogs could have also been scared facing human evolution. But yet here they still are, obviously smarter than us since they don't do shit but sleep all day ;).
A nanny AI is the more rational outcome considering that if we built a AI mind, we could control its parameters (make it non-violent, etc). Also fears of being enslaved and such are positively archaic. Slavery, as an economic system, makes little sense as its more liabilities than assets. If you were to suddenly conquer the world, keeping the capitalistic system in place would make the most sense. It confers a level of control and civility when done right. No need for a violent peasant or slave uprising when most everyone can find a job, rent/buy a home, start a business, advance their careers, etc.
Sadly, I imagine these high-profile attacks on AI are causing a chilling effect from a funding and research point of view. Its sad that instead of celebrating AI as something that could help humanity, we've instead demonized it and dismissed it. Shame billionaires like Musk can so trivially control public opinion and how so few of us are skeptical of his hysterical claims.