$100 Steem? I think your a little low. I've seen so many other BS coins with market caps well over Steem's which have absolutely no working product whatsoever. Ultimately Steem is battling for a piece of a market worth hundreds of billions. See this article for an idea.
(https://www.socialmediatoday.com/social-networks/heres-how-much-facebook-snapchat-and-other-major-social-networks-are-worth)
Luckily for us, these social media giants are pissing a lot of people off.
Now we all know how people love to follow each other when it comes to social media so the more people who come here, even more will follow. I've already deleted my facebook in favor of Steemit! Now I also think Steemit could even build a whole mini-economy within itself. Creating a craigslist and/or ebay style marketplace that runs on Steem and is incorporated into the social aspects of Steemit and DTube would definitely increase it's adoption and give Steem even more value. If these types of things happen, and these platforms continue to be fine tuned I think you will easily see $1000 + Steem within a relatively short period of time, but even that might be low long term. When Facebook goes the way of Myspace, all that money will have to go somewhere!