IMO the probability of it happening is about 50%. Considering the btc pump happening right now because of some factors, it is not impossible that a dump will happen soon. It is not also impossible that the price will continue to rise months from now so the probability of bitcoin reaching 1000$ each in 2016 is about 50%.
A couple of good days is all we need. With halving around the corner, we may even reach $1000 in July.
I would put the probability at over 50%
I think its impossible right now that the price will reach 1k value because more people are ready to dump their bitcoin one the price reach 800 value to 900 value and i think its hard to hit the price in 1k value.. as price today we see some people are dumping it right now..