I don't think there is much that can stop Bitcoin. Even if it wouldn't change for decades to come, it's still far better store of value than gold and we all know the market cap of gold. People and governments are slowly realizing this and the only way is up in long term.

When it comes to Steem and offering unique service, I think it's already doing that. Nowhere else is it so easy to gain monetary value in exchange for posting. We have to remember that we are still very early in to this game. Let's re-evaluate the situation once we have all these different services come to use (Zappl, Steepshot, SteemQ) - I'm sure we will have far more clearer picture of the future potential of Steem by then. But I'm positive at this moment.