These are possibilities for great growth, if the technology can be developed.  The first 3 are 50-100 years away though.<p>1) Asteroid mining and construction in space.<p>2) Nanotube or other materials technology enabling space elevators or Skyhooks, or other <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Non-rocket_spacelaunch" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Non-rocket_spacelaunch</a><p>3) Fusion through alternatives to tokomaks<p>4) Self driving, electric cars<p>5) AI and robotics<p>6) Micro Black holes as power sources (ok this one&#x27;s 500-1000 years away)