Dear Jacob,
congratulations for the originality of your essay. The difficulty in this Contest was to remain focused on the theme, while avoiding generic considerations. Your idea of exploiting transformative experiences for impressing a dramatic turn, or, rather, offering a restart opportunity to humanity, is attractive, and well focused on the Contest topic, in my opinion. It also has the merit of falling in the category of indirect solutions - the ones I personally prefer; attempting to address directly the problems that humanity is facing (war, demographic explosion etc.) is more obvious, and probably less successful.
I think we all have some personal experience, on a small local scale, of the effectiveness of taking a brand new start when personal problems (say at work, or within the family) appear too hard to be solved `directly`. I do believe that major improvements in human condition are never the (sole) merit of wise, explicit political decisions.
(I suppose another triggering event for a radical transformative experience for humanity as a whole would be the contact with extra-terrestrial civilisations, but in that case the stimulating challenges would be quite different.)
Having said this, I have the impression that your solution may suffer from being too `innatural`. What I mean is that, exactly because I believe that humanity is a sort of biological entity that evolves like a super-organism, I tend to consider your solution quite unrealistic. (For a metaphor, think of one of those movies showing, at accelerated speed, the evolution and spreading of a colony of bacteria or plants in the environment. You may see bursts of growth, but the pattern is still continuous, seamless.) Humanity may undergo smooth transitions or sharp revolutions, but, even in the most dramatic change, seeds from the past will inevitably shape the future.
(I am thinking at very practical problems, such as food supply: this would likely imply the existence of important communication and transportation channels between the two planets, with all the economic and social implications.)
However, I see that you do not exclude completely influences and interactions of some sort, so in the end we may disagree only in a quantitative sense.
Best regards, and, if allowed in your scheme, send me a postcard form Mars when you arrive!
Tommaso