There were high hopes for private space 5 years ago - Planetary Resources and Deep Space Industries looked promising. But they should to show some product at last which i don't see. SpaceX is on trend of course but ... we'll see. I think agencies should create infrastructure in space (like public highways), outside of our gravity wells - too much resources are spent to go in and out, and then private companies could use it. Or find a way to fight gravity ;)
BTW - great new feature in STEEM - I got notifications about replies to my phone! Today for the first time.