I can tell you the answer to this question:

What needs to happen to reach $10 STEEM in 2018?

What you've always demonstrated and encouraged by your efforts on ensuring that steemit.com/welcome makes sense, etc.

Holding steemit / steem a secret, to those that think they're lucky enough to know about it (and not tell anyone else) is wrong.

More users, more activity, more eyeballs, more commotion, and a bigger splash on the internet will create VIRAL steem. VIRAL want for steem power, and VIRAL buys for steem.

It will create VIRAL developers, and VIRAL apps, and VIRAL media press

...and when that happens, STEEM itself becomes VIRAL

What happens when something goes VIRAL?

It goes to the moon. If that happens, you won't be asking about $10 steem. You'll be asking about $100 steem. :)