The quality of life on Mars poses the greatest risk to SpaceX's plan to create a self-sustaining city there. I'm sure there will be plenty of people who will g

The quality of life on Mars poses the greatest risk to SpaceX's plan to create a self-sustaining city there. I'm sure there will be plenty of people who will go to Mars because it is a fantastic adventure. However, i doubt that many will want to stay there for more than 26 months. If too many pioneers choose to return to Earth, the project fails. You need a fairly large number of settlers to create something self-sustaining.