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Yep. Go with that and the solar system has room for trillions of people.

If we invent practical fusion power by then, we can also spread out into the Oort Cloud.

Just make it a choice, immortality or have children.

I have to mention this book:

Or have one every few decades, with plenty time to assess what worked and what didn’t.

Or a better choice of one child per immortal couple.

Ask China how that worked for them... Too many men, too few women.

Better than being allowed no kids like the GP mentioned.

That's were going multi-planetary is attractive.

Each generation gets a moon to terraform.