Mars could be a place to start again, to get things right without all the historical cruft. And the culture, the kind of person who would take that kind of risk has to be interesting. We have examples of this turning out well from the past.
Back on Earth, this would have a uniting effect by completely changing the playing field. I expect Fox News would call for something to be done about those anarcho-socialist martians and the superiority of pure Earthicans. Paranoid military planners will be concerned about scenarios where Mars attacks earth, especially with the outflow of all those entrepreneurial, intelligent, individualistic, explorer psyches. Sounds dreary right? But at last we would be thinking at a global level!