That's quite deluded. Elon Musk has done less than nothing to make moving to another planet feasible, despite all his grandomania dreams. We are thousands of years away from any notion of expansion beyond Earth. Even if he were to magically get a handful of people living on Mars (he won't) that is not going to bring us even an inch closer to something like a sustainable Mars colony.
And no, human beings do not naturally "consume and consume endlessly". In fact, the vast majority of those 8 billion people (say, 7.9 billion of them, or maybe 7.5 billion if you want) are consuming a fraction of the total resources. The vast majority of climate change is due to the richest ~10-20% in the richest countries on Earth. One way or another, this state of affairs will end in the next 50 years at most. Hopefully it will end in a more egalitarian society that respects the environment.
And no, human beings do not naturally "consume and consume endlessly". In fact, the vast majority of those 8 billion people (say, 7.9 billion of them, or maybe 7.5 billion if you want) are consuming a fraction of the total resources. The vast majority of climate change is due to the richest ~10-20% in the richest countries on Earth. One way or another, this state of affairs will end in the next 50 years at most. Hopefully it will end in a more egalitarian society that respects the environment.