I think to build "truly intelligent" machines, what you need above all else - and which I never hear discussed - is want . Everything about natural intelligence derives from the organism's wants - we want food, we want safety, we want sleep, we want to reproduce, etc etc - even fidgeting comes down to wanting physical comfort. Every single motion and action derives from want. As long as machines are simply executing…
The question is whether us humans would be left out to compete for resources, AI machines may at some point become able to out-compete us for resources. Do we really need to satisfy our desire to play God?
Another less than perfect possibility to come out of this could be AI based war machines - goal driven self sufficient entities that have two goals, to survive and to kill.