So evolution is just going to stop? Given enough time, humans will evolve to better survive their new homes.
evolution works over millions of years. The whole of human history is ~200 generations , during which nothing changed.
And no animal ever evolved to fly or live in outer space
That's a bit silly position to take. Different take would be if something happens to the planet, we all go. We need redundancy. Let alone all of the other possible benefits, starting with resources.