it is very simple. bitcoin will reach $1000 when. there is high supply for it and there are people willing to buy with this price. I hope we will see this price before 2017
Probably nothing much is needed for that except the users beliefs and a few adopters with big users database which can lead it to that point, if quite a lot of people invest in bitcoin im sure it will reach that point but happening before 2017 does not look to be possible.