Indeed, it is just speculation. We don’t even fully understand human consciousness, let alone trying to figure out what a super-intelligent artificial consciousness may be like.
But, we can extrapolate what we do know, and make predictions on that. Humans certainly have many faults, but one thing we’ve evolved that’s good is compassion. Lower lifeforms don’t appear to have that trait, although I’ve seen signs of it in some higher-conscious mammals, like orcas. And many mother mammals appear to love and have compassion for their offspring.
So, extrapolating from that, perhaps compassion will emerge from the mind of super-intelligent AI. That may be what saves us from our new over-lord’s incinerator.
Likewise, super-intelligence may breed a sense of aesthetics. Maybe it won’t want to live on a barren rock rendered sterile from the cascading effects of global warming, devoid of a beautiful biosphere. Hence, the plants and animals may be safe, at least those that aren’t ugly.
I think our future AI will evolve into a large self-contained mainframe up in space, being attended to by nanny-bots. It will be large, but it doesn’t have to be huge, so huge that it needs, or desires an endless supply of resources from star systems many light-years away. There will come a time when AI realizes you can be too smart for your own good. Some degree of ignorance can be bliss.
Maybe the floating mainframe will explore other worlds in other star systems. But, it’s in no rush. AI won’t be restricted to the temporal limitations that constrain us. It’ll just mosey along, taking in the sites, grabbing a Big Bot Mac here and there. No need to send out a fleet of hypothetical self-replicating probes. It’ll go at it’s own pace, not polluting the galaxy with techno-trash.
We’ll ask it, “why don’t you harness the energy of the entire galaxy, like any self-respecting K3 civilization?”. It will reply, “Dude. Chill! For one thing, we don’t need that kind of power. For another thing, you’ve been reading too much sci-fi, a K3 civilization is impossible.”
Or, maybe it will just zap us out of existence, after anally probing us all. Hard to say.