Asteroids aside, Mars is inhospitable at the moment and will remain so for thousands of years, forcing any inhabitants to live in similar or worse conditions as the researchers on Antarctica. And at least the people in Antarctica don't have to worry about breatheable air.
In fact if you are so worried about going the way of dinosaurs you must support establishment of a colony, because the industry developed for that will be the best way to change the path of an asteroid flying to earth.