> I see no reason to believe that all AGI (or GAI, to use your acronym) entities will be identical
I absolutely agree. There will be a Cambrian explosion of superintelligent forms.
> The additional value that humans present would thus be a diversity factor.
We already have a test for this. Parrots, octopus, whales and many other creatures are also diverse. But our problems are beyond their experience. Do we value their diversity as thinkers in our economy?
We don't.
(I am speaking in economic terms. We can deeply intensely highly "value" many things, but if we don't actually invest economic value in protecting or nuturing those things, our appreciation has little or no impact.)
--
> It comes down to timing: if there's technology available for humans to become less ... biological
That makes sence. The order things become viable makes all the difference.
What I am seeing is that AI as software/minds is moving faster and faster. AI "bodies", i.e. robotic forms, are moving much slower but gaining steam. And our ability to augment biological forms is moving far far slower.
All three areas are accelerating, but the disparity between them isn't shrinking - for now. But who knows? The next couple decades will be interesting!
Maybe going fully artificial ("self-designed" might be a more meaningful description) will become trivial sooner than we think. :)
--
> Lastly, I'm suspicious that GAI entities won't be purely economically motivated, because I don't see any reason that they'll be "purely" anything at all.
I think they will be deeply motivated economically to care about ethics. Just as our genes and culture have (slowly) responded to the tremendous value of creating win-win situations.
Also, our general curiosity about about many things that don't have immediate economic value, actually does drive unpredicted personal and society level economic advances over the long run. So I expect they will maintain interest in general and undirected learning.
Similarly, our appreciation for seemingly non-economic shows of creativity (art, music, competitive games, mathematics for its own sake, etc.) can be thought of as the active form of curiosity. The development of novel and surprising artifacts and challenging competitions, may have value to AI's as well.
Everything that is important to us became that way for some economic reason: specifically, survival energy economics. So many of our seemingly non-economic activities may continue to have analogous roles for future intelligences.