Hi Robert, thanks for the comments!
You may be correct that humanity will solve the problems of the commons on Earth--and I do hope this is the case. But in the even that we don't, then I worry that Mars will be an extension of our unsustainable development patterns. Even at interplanetary distances, I'm not convinced at autonomy is inevitable for a Martian settlement. (But if we instead talk about interstellar colonies, then I agree.) Trade would be tricky, and the initial Martian colony might be reliant on goodwill donations from Earth. However, in the event that the Martian colony eventually did succeed, then trade restrictions should eventually be relaxed and allow for interaction between these two, independent civilizations.
Getting past the "wild west" phase of Martian colonization is a big risk, too. However, I think that this anarchic phase may be precisely the stimulus needed to derive better forms of governance than we have today.
Cheers,
Jacob