You forgot @dlive!
Twitch is getting more and more popular every year - Just because eSports is doing so!
But Twitch is not really nice to most it's streamers from what I have heard.
Combine these two facts with the two million SP @dlive has delegated and the therefore rising promotional possibilities and you will see another application of the STEEM blockchain with a huge potential to benefit us all ;)
Otherwise I completely agree with you on seeing tons of potential - Even though even a three digit price seems totally unrealistic(or at least unbelievable)!
Another interesting thing might be VICE, a porno-token based on STEEM (don't have much infos here) - That would be another industry with a lot of money involved ;)
Gonna upvote this comment for visibility!
Greets, Martin
@dmania, @what-app similar to quora, even busy.org or chainbb.com.