Also, the Birch World is specifically made to work around a Supermassive Blackhole. Why, is because you'll have the power from the Super Black hole, which will last till the end of time. And you'll have enough surface to handle definitely enough people.
At that point, the only thing that would limit humanity, would be resources, and management.

Yep, what's neat about the Birch World is that, with enough concentration and effort, It can be completely self sufficient if given enough population.

Its a birch world, meant to use the hawking radiation from a black hole to power itself and preserve a civilization till the end of time itself... at least, if said civilization isn't killed or kills itself.