I don't think so. For most asteroid impacts, we wouldn't even need to build subterranean shelters for the species to survive. It isn't enough for the species to

I don't think so. For most asteroid impacts, we wouldn't even need to build subterranean shelters for the species to survive. It isn't enough for the species to survive. Our civilization, particularly our very technological civilization, must survive as well. Without such a civilization, we'll be trapped here until the Earth itself dies. Our long term survival depends on the short term survival of our civilization. The relative habitability of Earth and Mars may actually have a converse effect on the survival of a technological civilization. On Mars, such a civilization would be necessary for continued individual survival for what may be geological time scales. On a recovering Earth, humans may salvage civilization, devolve into a new and indefinite dark ages, or give up on civilization entirely and the species will still go on.