And you are assuming they don't remain in control. Which of you is right? We don't know yet, but I don't find the arguments of card-carrying doomers any more convincing that those of card-carrying singularitarian utopians.
Historically though, technological improvement has lead to large increases of living standards for the overwhelming majority of people, so I think that past trends support the utopian view more than the doomer view.
The anthropic principle applies here: anyone warning about an existential risk will by necessity never have precedent to point to.
I am not assuming humans don't remain in control, but rather, I am not axiomatically assuming there's any inherent reason we will.