$20k may even be possible by the end of 2017 now.
Due to the arrival of institutionalised money.
No, It's too hard. I don't think that bitcoin can reach the 20k$ by the end of 2017. I think that you are too optimistic about bitcoin. By the way, I think that bitcoin will reach the 8.500 or maybe the 9000$ in the end of this year, Also when we talk about the 20k$, I believe that will happend next year.