I think bitcoin have no chance to reduce 4000$.because, bitcoin have good future.so, now time to buy some bitcoin and wait for profit.
There are possibilties that Bitcoin will reach that ATL for this year in which the reason is still because of Mt.Gox too. If you heard well or read well the news it says that there are still a huge amount of Bitcoin at their dispossal in which if they will sell again it will result to further decline of Bitcoin value.