

Depends on how far you’re thinking.
Nowhere else in the solar system is anywhere near as habitable as Earth, and there’s still lots of empty space to fill on Earth. Consider for a moment how much easier a city on Antarctica would be than a city on Mars. Human space travel is done purely for science or recreation, at this point, not for growth.
If you want to “disperse” in any significant way, you have to start looking at exoplanets, and it’s going to take centuries to get there, and we don’t have the technology to survive that yet. Once we do, there’s a strong argument for it, because our planet and solar system will only last so long.



It’d be surprising if we haven’t either ruined ourselves or achieved an actual end of history by 2300. So, that.
The savings from completely ignoring space aren’t what people think, though.