Im not that sure about the approximate price of btc 2 years from now but if it has survived and solved the problems it has now, it's price would be at least 5500$ in the next 2 years and it slowly rised to reach that point. If not 2 years from now bitcoin price is relatively lower than the current price and has already reached it's peak price for the next 4 years from time span of 2016-2020. It could also be that price is halved by that time but who knows, 2 years is a very long time so no one can tell.