Udo: If the last line of your post was addressed to the SGU rogues, note that they don't seem to read or respond to posts here. But you can email them directly. They do read their email, and sometimes reply.
I agree with you in being skeptical of a Mars colony, though for somewhat different reasons: People migrate because they are pushed out of their old location, or because they hope to improve their situation or are paid (or forced) to move by people who finance the new colony in hopes of extracting wealth from it. Perhaps a future dictator will force people to go to Mars the way England deported criminals to America and Australia, but the prospects of life on Mars are so grim, and the possibilities of extracting wealth to pay for the colony are so slim, that I don't think it will ever happen. A research station, perhaps, funded for the science. But a colony of people who relocate permanently, I think that's just fantasy based on the romantic notions of science fiction.
Going beyond the solar system is even more of a fantasy. There is no benefit to people back on Earth of a colony ten or twenty or a hundred light-years away, and unless we send a probe and wait for data to return, the hopeful colonists will be embarking on a multi-generational voyage with only a microscopic probability of finding a habitable environment when they arrive at their destination.
Whether Mars or a generation ship to another star, medical care will be so rudimentary it will be like going back to the 18th century and end-of-life care for degenerative disease will be a cyanide pill. They'll be able to set broken bones and extract teeth, but they'll be unable to manufacture medicines or perform hardly any of the procedures we take for granted.
Welcome to the SGU forums, and I, for one, agree with your skepticism on space colonization, though I think we are a small minority .