It's possible, looking at the current market status that we can pump $2,500 in just few days, $20,000 by the end of the year seems plausible, but the chance is low. Right now, it's struggling to reach $10k and even going down as low as $9,200. But given the volatility, the pump chance and amount, we could reach it but I doubt it would stay there. It's most likely to hit back down just like the 2017 hype, because of manipulators and other factors.
There are maximum chances for bitcoin to increase in value significantly by the end of December but reaching 20k and above seems feasible in the first half of 2020. many factors are supporting this prediction such as acceptance of blockchain technology by China. But yes, nothing is impossible so if all investors start investing huge amounts into bitcoin, it can easily reach 15k plus by December.