SpaceX is building a railroad to the solar system. It will change everything, and quickly.

> The railroad was bringing people to a land that was already successfully settled by neolithic peoples tens of thousands of years earlier.

That's what people thought before the railroad was completed.

See "Nothing Like It In the World" by Stephen Ambrose:

https://www.amazon.com/Nothing-Like-World-Transcontinental-1...

> But the question is what can they do that's more useful than communication satellites to people on Earth?

Sure. And nobody predicted how incredibly useful the transcontinental railroad would be.

"Nothing Like It In The World" by Stephen Ambrose

https://www.amazon.com/Nothing-Like-World-Transcontinental-1...