Price predictions vary between $0 and multi-million dollars, depending on who you ask. The reason there is so much variation is that essentially everyone is guessing.
That said - if you look at the all-time chart for bitcoin on a log scale, then a cyclic upwards movement of higher highs and higher lows becomes apparent... so predicting based on history, and that we are just coming out of the dip stage, then the price in 2020 will be somewhat higher than now.
That is not completely true, while it is true that people are guessing when it comes to the price of bitcoin and the ranges are very wide I have studied the movements of bitcoin and the volatility is so high that in fact both of those scenarios are possible when you only look at the numbers, so those making those kind of predictions are not so wrong, now the only reason why I know bitcoin will keep appreciating in value is because I can look past the numbers and can see that bitcoin gives a valuable service that did not exist before and as such it will keep going up in value.