That’s a classic tech will fix it narrative. The likelihood of us making it off the planet at a scale that matters to common people is basically zero.

It’s arguing on faith that we will move of the planet to defer living sustainably on the one we have which is a classic ruse to e able people to rationalize not changing lifestyles.

How much biomass and quality of life do they support? Moving metals onto the earth is "resources" but not the ones that sustain human populations.