When researching future possible advancements for my novel, which can be seen above or on amazon with over 300 reviews to them all, I found lots of interesting developments that could come to light.
Asteroid mining is one, as the human race depletes all resources we will one day have to look elsewhere, that is where asteroid mining could come in. We could gather such things iron, nickel or even titanium for construction.
Also asteroids could become a stopping point on long space journeys, allowing the crew to stop and replenish supplies.