1. Bitcoins already underwent several corrections (last one only a few days ago). These small "crashes" later resulted in longer, more stable phases. These substantial downturns flush out most bubble activity. (Bubbles usually go up until they burst. Bitcoin is generally all over the place. Very un-bubble like. When a bubble crashes, it's pretty much done for. When Bitcoin crashes, it's two weeks of wild swings and then soften on a new baseline.)
2. Bitcoin is an erratically growing commodity / currency. If Bitcoin succeeds long-term, then it's hopelessly undervalued currently (just because of the limited supply). If not, it's not worth anything. Basically it has a high risk associated with it and no safety net or more traditional baseline measure you could work with. This inevitably results in erratic price swings no matter what you do. For instance, the current price is mostly due to China getting into the game. There are still many other countries that are not even on the playing field. No financial instrument could prepare you if the demand rises because another big interest wave comes (like India) and the price needs to find a new equilibrium a magnitude higher.
Considering that Bitcoin got a value increase of 24543% in the past 2 Years, it's course corrections are outright tame.