I think by the end of 2018 bitcoin will cost much more than $ 50,000. Most likely about 80,000.
Last year bitcoin cost $ 950 and everyone gave cautious predictions that it would cost $ 2,000 or $ 3,000.
Absolutely no one could predict that bitcoin will grow to $ 20,000.
That is not true. There is an analyst, Ronnie Moas, you can google him, who said in August 2017, when BTC was only around $4,000, that Bitcoin will reach $15,000-$20,000 in the next three years. Well, it happened faster than he thought, but he was right in his prediction in general. Btw now he says that Bitcoin will hit $300,000 to $400,000 eventually. We'll see if he is right this time. )