We don't need to terraform Mars to our incredibly fine tuned biology. What comes next will evolve beyond our limitations. Humans are a stepping stone. Just a blink of an eye in an infinite time scale.
I'm not suggesting putting biological organisms anywhere. I'm suggesting that at some point in the future an AI will be able to rapidly modify its own substrate independent of biology, metabolic inputs, and genetic inheritance. That it won't be subject to information loss due to death or other physical constraints. That it will much more quickly be able to build support systems for itself to harness energy and raw materials wherever it goes.
Unless we kill ourselves in the near future, these systems will likely emerge and will likely proliferate faster than us. They're not going to be stuck on earth with us. There are abundant energy resources and building materials in the solar system and greater galaxy beyond.
HN is quite a bubble, and we often form an echo chamber that strongly agrees with itself.
When you realize there are no hospitable planets, besides earth, within our solar system - you will realize there is no escaping the problems we have created here on earth. No, they must be solved, not avoided.
There is no future where any of us alive today, or for many, many generations (dozens, maybe hundreds or thousands, if it's even possible) will be capable of traveling to another system with potentially hospitable planets.