&gt;that a mid-to-upper class family in California might decide to move to Mars instead of buying a house on Earth<p>I don&#x27;t know the details of what he suggested, but, when we talk about &#x27;families&#x27; I think most parents would hesitate to subject their children to the rigors and risks of an early-stage Mars colony, even thought they might be keen themselves. Retirees, the childless, and people without plans to have kids soon would be a safer bet for early colonists