1.
"I'm very optimistic about the future but nearly certain that humanity in its current form with a high population and corporal bodies will not exist. If human physical capacity and human thinking are both superseded, then what is the point of humans surviving? There will be no incentive from any entity to keep us alive. I don't see that as an issue.
In fact, you might be 99.99% certain that you yourself will die some day. Does that make you pessimistic about the future because you will no longer exist in the world? No, as long as you pass down your legacy to your successors, that's good enough. The successor might be your genetic progeny, your ideas, your values, your works, your influence, etc. Why can't AI beings be the successor?"
3.
"Call it what you will. I think what I am describing is reality and not biased by human moral standards. Maybe we will be kept around as pets or zoo animals if AI has the same sense of entertainment as we do. That's fine, I think it's perfectly natural that the strong dominate over the weak, and the efficient rule over the inefficient. That's why I am always optimistic about AI development even if it results in the end of humanity."
5.
"Let us distinguish between what "is" and what "ought to be". A rock does what it does. You can make a very reasonable argument to the rock that it should not fall down in a landslide and kill people, but it will still do what it will do. Even for humans, a certain system of incentives will make certain outcomes inevitable in the long run, no matter what anyone thinks is moral. I think the destruction of humanity is inevitable because there would be no incentive to keep us alive. This is not a statement of morality, I consider it a statement of reality. It's not good or bad, it's just something that will happen. It's like if I drop a ball from my hand then it will fall down to the ground. I'm not going to judge whether it's good or bad that the ball drops, it's just something that will happen.
Are you pessimistic about anything that leads to your death? I will tell you that the number one cause of death is being born. Should every human regret being born then? Every single person will die. Death is not something that is regrettable. So why do we live? I don't have an answer for you. You might ask why does a tree live? Why does the land and the sea exist? For what purpose do they exist? There isn't one, they just exist. Same thing with us.
Who decides who should continue to exist? Those who are fit to exist will continue to exist. It's just a tautology. The ones who exist, exist. The system makes a judgement. So I am saying that since AI will supersede humanity in terms of intelligence and physical capability, naturally they will take over from humanity as the dominant entity on Earth. Then let it be so."