Some of the other things you suggest, like future systems keeping humans physically alive, do not seem plausible to me.
I agree with Gretta here, and I think this is a crux. If MIRI folks thought it were likely that AI will leave a few humans biologically alive (as opposed to information-theoretically revivable), I don’t think we’d be comfortable saying “AI is going to kill everyone”. (I encourage other MIRI folks to chime in if they disagree with me about the counterfactual.)
I also personally have maybe half my probability mass on “the AI just doesn’t store any human brain-states long-term”, and I have less than 1% probability on “conditional on the AI storing human brain-states for future trade, the AI does in fact encounter aliens that want to trade and this trade results in a flourishing human civilization”.
I agree with Gretta here, and I think this is a crux. If MIRI folks thought it were likely that AI will leave a few humans biologically alive (as opposed to information-theoretically revivable), I don’t think we’d be comfortable saying “AI is going to kill everyone”. (I encourage other MIRI folks to chime in if they disagree with me about the counterfactual.)
I also personally have maybe half my probability mass on “the AI just doesn’t store any human brain-states long-term”, and I have less than 1% probability on “conditional on the AI storing human brain-states for future trade, the AI does in fact encounter aliens that want to trade and this trade results in a flourishing human civilization”.