So, basically, what you are saying is that you can't envision any level of technological advances in rocketry, aerospace engineering, or genetic engineering, that would allow us to terraform a planet, build colonies under domes, or build permanent habitable structures in space and on the moon. Earth has a time-line, it and everything on it will eventually die, so either we learn to spread life through this system and other solar systems, or this is it. Which is okay, everything and everyone has a cradle/grave point. But if this is it, we could stand to be a little bit nicer to each other, other species that share the planet with us, and the Earth. Our track record there is not so hot. If everything is based on what we know 'now,' we would never have gone to the moon. Mars is hard. Not impossible. Overcoming that may teach us to be better stewards here.