The whole cryptocurrency market is still very small and everything that´s happening right now can definitely be considered to happen in the early adopters stage. The Pipelines from fiat into crypto and back are just so small right now that the masses can´t get in easily but that´ll definitely change whenever the banks and wallstreet fully jump into the game.
Regarding Steem I fully agree that 100$ could be a possible price at the end of 2018. Of course we can´t say that for sure but the pure potential this Blockchain bears along with about 1.000 new users joining every single day I don´t think we´ll stay out of the top 10 for long. Investors will drive the demand to new levels as soon as they hear about steem and what awesome technology it is.
Further Commercials on Steemit are impossible so what do you think will big institutions do, right, they´ll invest to be able to promote their products. That being said they have to put money in that´ll be given back to the people, not any owner of a social network!!!