We will see 600 $ mark in the last days of first month of this new year.This current speculation will take the price gradually higher and 600 $ is easy to touch.I am waiting this to happen in coming weeks.
There is probably close to 0% we will see 600$ in the first two months of 2016 though. Its pretty optimistic to expect 600$ in the first half of a year too.
Overall i think 600$ is possible during this year, somewhat likely during first half, and close to unreal in the next month or two.
I know that you are smarter than that, MM, no?
Personally, I'm not sure at what level I would place the chance of going over $600 in the next couple of months, but "close to 0%" seems to be extreme and unrealistic rhetoric.... even a prediction of 5 or 10% is much more realistic than "close to zero".
With some of the current financial turmoil, and also the fact that BTC prices have been floating in the above $400 territory for about a month, BTC prices are certainly within reach of $600.
Furthermore, if prices were to go above $500 and stay above $500 for any significant time (such as 3-5 days), then that price movement could likely receive attention to cause some of its own additional impetus... We also should recognize that historically, bitcoin already had a considerable period above $600 - yet there has been a lot of infrastructure development since then and fairly obvious entry of broader financial segments into the bitcoin space.
Yes, I am describing several what ifs, but these what ifs are not unrealistic, unlike your close to zero prognostication.