IIRC in Evolution civilisation collapses in the near future after some massive volcanic event and the few survivors revert to feral hunting apart from a few cryogenically preserved soldiers who all get very depressed about the situation and then die. Or something like that. Not sure how this is relevant to Mars.

Baxter's fiction tends to take the line of "what we think of as humans will be very short lived on a galactic time scale, but life will be around".