Isn't the answer, Why not?
And in
@We Never Know 's post #15 above, the AI mentions resource depletion, which brings us to the SF topic of mining on the moon, the other planets, in
Alien's case other star systems. If as we presently believe nothing can travel faster than light, then (as the view of the future seems in 2023) humans aren't going anywhere, But our mechanical alter egos may populate the galaxy ─
Homo mechanicus. Or perhaps some biomechanical synthesis ─ just not naked humans in the void.
And there's also the psychological angle. Humans are gregarious ─ it's deep in our nature and it's made cooperation possible, perhaps the greatest of evolved human tricks. The first settlers on Mars, assuming there will be some, will experience an isolation that has no precedent, or even an analogy of a precedent.