The reason why I believe that in a short to medium range of time STEEM will earn a gazillion of attention is that youtubers will see their true potential and will migrate here. I see a lot of bloggers and youtubers that yould do literally anything to get a few bucks.
Imagine what they will do when they will realise thousands of dollars can be made here.
I also think that in the near future the STEEM team must come with an anti-spam solution, because spam is also inevitable.
Just my $.02!