Undoubtedly, bitcoin will grow in the future. I'm not sure that by the end of 2018 its price is $ 40,000, but to return the positions to 20,000 actually this year, which will give a good platform for further growth.
Yes, you are right.
I am more confident that prices are starting to recover at $ 20,000 by 2018. My estimate may be that by 2019 it will cost $ 40,000.