If you put one crab in a bucket, it might climb out. If you put many crabs in a bucket, they will actually stop each other from climbing out. This is an extremely common metaphor.
> Living in space is essentially like living in the ocean with all the same environments challenges.
Maybe we’ll do that too someday.
> This planet will be habitable for tens of thousands of years at the bare minimum if we take care of it
With a very limited amount of space and resources. We got into this discussion because of concerns about overpopulation. The Earth has plenty of natural resources and can almost certainly handle a much higher population than it has now, but exploiting the rest of the solar system will make it last even longer and allow significantly more material wealth for every person alive even at a significantly higher total population.