It is sustainable at worse we may see the rewards be decreased a bit but the core system will keep on going. Once we have hit this level of innovation nobody wants to go back to the older more slower boring system. That would drive us crazy! That would be like invent a car and then go back to horse. People never wanted to do that so in a few years everyone jumped ship over to the car.

Right now I would say you at least get 10X more in return on Steemit than on YouTube. Especially if you highly invest. And now I'm not even taking of the fact that Steemit may go up in value especially when it comes to the Steem currency. The Smart Media Tokens will be so super exciting to see other websites starting to use Steem tokens and how that will probably open up for more mainstream attention. Should at least 3-5x increase the awareness and bring attention to these new platforms. Amazing for early adopters.

Not like we can stop this evolution. Technology keeps on moving forward. It clearly now has started to have a life of it's own. If we consider the amount of Facebook users that exist above 2.2 billion active monthly then we can see the reach these new blockchain technologies may have in a few years. Will especially be nice to see more competitors on the market. It's amazing how we don't have at least 5 already. They are truly lagging behind Steemit! Eventually they will come. And as you said it will still be awesome for the users since competition is better than monopoly!

Just as you said bring value and your A game will be all! Whoever that brings the most value wins this game. But now when it comes to winning it will be about spreading that wealth back by sharing it with other hungry value givers. So we create a super effective positive feedback loop. Clearly we are building something but what we don't know yet. All we know is that it will be super powerful.