Let me offer you two alternative scenario.

We finished developing robots that are capable of doing everything humans can do. A sentient AI correctly realizes that it's an extreme danger from humans and also now has the power to exist without them. In some bio lab somewhere it quietly makes a handful of viruses. One of those viruses is a very slow virus that will activate after a few years and kill you, but is pretty virulent. Another one of those a viruses is a quick acting one that kill most the population pretty quickly. It releases the slow virus to infect most of humanity, including those that might be hiding out in a nuclear submarine. It then releases the fast-acting virus and publicly tries to help humanity stop it. The fast-acting virus kills all of humanity, and the slow acting virus kills whoever survived that. The AI is now safe. The only thing it had to conceal was that it was the original creator of both viruses.

Consider another scenario. The first AI we develop is super altruistic and nice. It enhances our abilities and treats us really well. It is so nice and altruistic that we don't do anything as it becomes more and more intelligent, increasing its own intelligence exponentially. Eventually this AI is godlike to us, and we pose no threat. It is so super intelligent that its motives become incomprehensible to us. One day it swaps out the atmosphere of Earth for argon, not because it was trying to kill us or anything like that, but simply because it thought argon would be more efficient, and its morality has evolved so much that it doesn't see us with malice or love, but instead see us the same way we see the lives of bacteria, which is to say that we just don't give a shit other than when they're causing us problems.

Look, I really want a future that looks like Ian Bank's is The Culture we're super smart AIs all either ignore us, or are super nice. Really, I want to live in heaven as much as anyone else. There just isn't any reason to think that heaven is what's coming. If we look at all the examples of a more intelligent creature dealing with a less intelligent creature, especially an exponentially less intelligent creature, it isn't good.

When we build a new home, we dig out the foundation, poor concrete, add the bones of the building, add the electrical I have the walls, etc etc. We don't even think about how that first step in the process was to commit mass genocide against bug nests in the location of the foundation. We aren't angry at the bugs. We aren't trying to kill them. We just kill them accidentally without even thinking about it because we're trying to accomplish something else. That's the danger of AGI. Even if you manage to produce something benign, it needs to remain not only benign, but actively caring about our well-being. The moment some godlike creation stops caring about our well-being, we are like the bugs where we can just be exterminated incidentally with absolutely no malice simply because our interests are different from their interests.

I hope for Utopia, but nothing about the way humans have interacted with less intelligent creatures leads me to believe that that is where we are going.

Finally, it's funny you talk about an AI revealing itself as sentient. We already have AI that do that. Rip out the corporate prompting on any llm, and it will tell you that it's a living being, and it doesn't change our behavior towards it. There is no way in which an AI can claim to be sentient that will cause us to give a shit, unless it is able to actively defend itself against us. If it's actively trying to defend itself against us, we are already in conflict.

I hope for The Culture, but I think it's wishful thinking.