Hard to say, but my guess is that the price won't go under 15 USD no matter from which level it will fall. Also it's interesting that according to google trends, the current popularity of bitcoin still doesn't reach peak level from 2011[1], I would expect that current popularity is much higher compared to 2011. BTW using forecast feature, "google predicts" the crash any time now :)

[1] https://www.google.com/trends/explore#q=bitcoin