The the price of Bitcoin isn't regulated by any recognized agency but by the happenings in the global market, the demand & availability of the coin and sometimes the sentimental opinion of the big crypto currency investors, I think it's very difficult to predict the price of Bitcoin over particular period of time.
One can predict a rise from the current at the end of the year while we experience a significant fall from the current price while another predicts a fall from the current price and the contrary happens at the of the year.