We are entering in the new type of economy where price predictions are not possible any more because productivity and prosperity of humanity will rise to the new golden age level. Bitcoin will go to 1 million dollars in 2018 and is being used by central banks as a global stardard ledger - dollar will fade slowly those who buy now will become the new wealthy elite.
I don't know about that because something might be about to hit us straight up to our face and we just haven't realized it. Bitcoin or the blockchain technology has the possibility to change the way we do things especially for things that involve transacting with other people. On the other hand, it's still too early to say something about bitcoin's future. The only thing we can do is wait for it to actually happen. We can anticipate both things because there are only two scenarios that can happen at the end (or at least at the end of our lifetime that we can witness).
The first one is bitcoin actually being successful. Obviously you wouldn't be so sad here but what you have to do is actually save some coins. The second one is bitcoin falling down. If you have saved bitcoin, you would be devastated. So you have to be in between of saving coins and getting rid of coins.
We are not so sure about dollar's future because it is a traditional currency. People are looking after it and duh, America is a dominant country so dollar fading out is actually a little unusual unless people have embraced cashless society and moved on to being independent from the government and started using virtual currencies to deal with each other. I feel like this is going to take a long time and we might not be able to live long enough to witness it.