My take is that it is a bit early now, but we will land a man on Mars in the next 20 years. Then, like with the moon, there will be a time of stasis, until a real colonization will take place.
There is one place on Mars that is very "low", with higher temperature and denser atmosphere, which would be the logical place for a first settlement.
O2 can be produced from CO2 just like in submarines with scrubbers, and i guess mankind is able to build airtight structures to live in.
In the long run we will have to leave earth, the next "big one" can kill mankind anytime.
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>^..^<*)))>{ All generalizations are wrong.
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