By that reasoning, no-one ever leaves. If no-one had ever left, you may as well have left and be there already. I think the reason to leave will have to be som

By that reasoning, no-one ever leaves. If no-one had ever left, you may as well have left and be there already. I think the reason to leave will have to be something other than space-diamonds, or other monetary needs. More like planetary conquest and scientific advancement.