I don’t really feel capable of giving a reasonable answer to that question. The ability to terraform it? > If you scale out to a 10,000 year timeframe AFAIK t

I don’t really feel capable of giving a reasonable answer to that question. The ability to terraform it? > If you scale out to a 10,000 year timeframe AFAIK there were no events at last several hundred million years that had a realistic chance of making the Earth less habitable that Mars. So unless we had a ways to cheaply transport millions of people to Mars (maybe space station or the moon would be a better option though?) focusing on building infrastructure that would allow us to minimize the impact of meteorites or massive volcanic eruptions as much as possible.