Humans are an intermediate step. We are not the final shape of earth-origin intelligence.
Why would we continue to fill these bodies when we develop the tech to no longer be so limited? Constrained to the parameters of our gravity well and to short lifespans without backup?
Or maybe we just get replaced outright.
Or, the worst outcome, everything from this planet dies without ever having left.
A kool-aid style cult where they convince their followers they will be “uploaded” once they hand over all their possessions. Then they just get shot in the head.
AI might do it, but I wouldn’t count that as us going there.
Thinking 'it is good' is a product of your consciousness. When there is no one to judge then there is no 'good'.
Somewhat related is the story of SOMA, which, spoilers ahead, involves you realising the earth on the surface has been wiped out, and putting faith in a person who's brain scan currently lives in a robot, to get you both into a simulated paradise that will be shot into space.
Some fairly fundamental things need to be answered first. Things like how does consciousness and the sense of self arise.
Naively, if you think that you are just a program that runs on a bunch of neurons in your brains, and that this program can be uploaded to a computer, you are still left with a very annoying problem: you upload a copy, and leave the original running in your squishy brain. So what then? Do you kill the original? But that involves killing a living and breathing human being. Do you wait until it dies naturally? That's still not a good answer, because you have to die so that a copy of you can continue existing.
So until we figure how to actually "teleport" our consciousness to some other host, we are in a pickle. And there's absolutely no evidence that we'll ever be able to do this teleportation. What if we never figure out the physics to do this?
Edit: I suppose you could sidestep this by generating fully digital consciousnesses that mimic what a human brain does. So a fully digital human. Assuming we can brute-force simulate a real human brain, this should be at least physically possible (as opposed to teleportation), but this still raises philosophical questions. What you are generating then aren't human beings, but conscious AI. You could argue that the human race would eventually be supplanted by immortal AI that are no longer bound by biology, but I'd argue that this isn't an evolution of the human race, rather a completely new life form (if you can call it that), which has nothing to do with humans except that we created it.
Imagine none of what you've presumed is necessary is even a design objective. Maybe it is, but probably it's too difficult and uneconomical. These capabilities could be built without ever enabling any of us to live or achieve immortality.
Those hypothetical digital beings could be human-like, maybe exact simulations, or perhaps totally different. They could be benevolent, or perhaps not. We might come to a conclusion that it's no longer ethical to have biological humans. Or maybe we're forced into that outcome.
Who knows. This is all wild postulation. But one thing that might happen is runaway growth and a deviation from a world we're familiar with.