My greatest fear is that space will become the playground for the rich and powerful where the rest of humankind is left to suffer on an overpopulated, polluted Earth. We as a society can't live on the kindness of individuals to achieve a better future and that goes double for leaning on SpaceX and Elon Musk. They are a for profit venture and that means unless you're rich enough to pay your way then you have to pay with labor which may or may not be pleasant. I know it seems silly to imagine the future like that but the way the rich and powerful have been running the world so far I can't see them giving a flip when they can have safe, sanitary habitats in space which separate them from the existential threats on Earth. At that point they could just say "fuck it" and cut the rest of humankind off from space easily with threats of asteroid bombardments or worse.
Don't worry. If anything, space will become the graveyard for the rich and powerful once they realize how poorly the human body fares in high-radiation, low gravity environments.
Oh, at last, a bit of reality... I'm sad that maybe we'll have to watch hundreds of people die for a completely unrealistic endeavor, and they'll never have a grave for their loving ones to visit.
I imagine we'll initially have the working class inhabit non-Earth places such as the moon, Mars, etc. Once the risk of the frontier is mitigated, we'll have a gentrification of sorts where the working class is pushed back to Earth and the upper class take the non-Earth areas back over. People with the means will work remotely from a different planet, companies with the profits will gravitate towards sexier places, and governments will hope to colonize other areas.
