Depends on time frame. In the next month, I think the bottom could be $6-7k. Over the next few years, I think the bottom is zero. Bitcoin cannot be used as a currency or store of value, and therefore is really worth 0. It is being held up at a multi-billion dollar market cap because of irrational investor behavior. Maybe an alt coin will take the place of bitcoin, but bitcoin's technical and scalability problems are ensuring that it will never reach its dream of becoming a universally used currency.