It is still mysterious what will bring 2020 to bitcoin, make any prediction about the price what it will be by 2020, in fact very hard for anybody to tell the exact price but looking over the growth chart than it looking it will be around $9000 - $12000 as per my personal thinking.
of course it is really hard to predict what the prices of the bitcoin is going to be in the near future, i believe we might reach way bigger heights at like 50000 dollar per bitcoin