Although this thread was created long ago I still would like to drop by my opinion. Actually this thread is appropriate for every moment that bitcoin goes down. Yes good to buy bitcoin when it goes down because the price decreases and maybe in another day bitcoin will goes up again rapidly. So better grab to buy while it is on red color.
I think It's the best time to buy it and wait for that moment when Bitcoin touches $ 20000 again. There's always the possibility of Bitcoin to jump that's why Bitcoin is different from other people's coins. As 2017 this year will also be good for Bitcoin investors.
We know that the ups and downs come in the crypto business which should be taken easily because this is a good time to buy Bitcoin as it will get back to its original position and we also know that Bitcoin never jumps and gives big profits.