It is very difficult to predict bitcoin prices, but in my opinion the newbie in the field of cryptocurency that bitcoin prices at the end of the year will continue to increase even if the value is not doubled, possibly reaching up to $ 10,000 / BTC.
It's hard to predict, no one knows what happen tomorrow it's hard to say when it up or down the value of bitcoin. But we know bitcoin is still fighting in long 9 years and continues giving us hope and good profit, that's why I believe in bitcoin at the end of this year it will give us good profit.