Bitcoin unlike the dollar is not backed by the US Gov't. When it goes it will really go down hill. Billions will be lost. No one should have more then 5% of their nest egg in Bitcoins. Just came back from a conference about this issue. Most people are halting their purchase of bitcoins and other "coins." Myself, I sold all of my Bitcoins but 3%. Take this advice with ever grains of salt that you want but when million and billionaires speak I often listen.