The key will be to divide and multiply Gaia
If the Earth really is an organism then it must divide and multiply or face extinction.
Think of a spacecraft as a living cell. Then think of the Humans inside of the spacecraft as self-repairing strands of DNA that can also repair damaged cell walls, build new cells, etc...
We have a long way to go...But I am confident that some of us will get there. (Most won't)
