My estimate is BTC will hit 450-550$ in 2016 ( this year ) later i think over the next 4 years its will hit 1000 - 1500$ for each BTC but its hard to say, but we need to dream ^^ and now when Steam soon allow BTC payment, i think the BTC will hit new price levels again (more than previous record).
i think bitcoin can reach much higher prices in this year. there a huge event on the way, i am talking about the block halving. and it is going to push the price to at least $600-$700.