Since the low in January 2015, the price of Bitcoin has been increasing at a very consistent rate of about 6% per month. As shown on the graph below, the price should hit $1000 in June 2017 (+/- 2 months or so) if it continues at this pace.

Add the approval of an ETF and the price hits $1000 tomorrow.
Unfortunately, it's still a long regulatory way to go before the first bitcoin ETF actually hits the market, but when it does, it will go past $1000 in a matter of days.
I believe that when first bitcoin ETF hits the market
BTC will go past $1000 in a one day.
that may be true about any price but i doubt it can be true about $1000
it has some kind of color to it that people are waiting for it to hit, and as soon as it hits that is the goal of majority of long bitcoin hodlers to unload on the market and break the price maybe not much bit it will definitely be hard to keep that price for a long time.
The day when bitcoins hits $1000 price people will start selling their coins and it will definitely affect the price very badly as we may see price going down after that as majority of users are holding their coins since long time so that they can sell their coins when it reaches to the price level of $1000.