Well a lot thing can happen in a year, but considering some more countries will legalize bitcoin i believe its possible to achieve 4000 dollars into one year if more countries does legalize bitcoin, if the same countries remains, well i would say 3000 dollars.
Thats the main issue dude for the price increase. More and more governtment and corporations are buying and investing in btc with that kind of prices. So there is no doubt that the price could reach 3500k in my own speculations. The price went low for the mean time so i guess many have tried to buy it or even planninv to buy.