The biggest risks are these:
1. Strong U.S. or Chinese regulation
2. An irreversible, fatal flaw in the Bitcoin protocol is discovered
3. A competing cryptocurrency, or other emerging form of money, manages to outpace it in growth and steal its thunder
if more people try to sell bitcoins than want to buy them, the price will decline. possibly rapidly.
The biggest risks are these:
1. Strong U.S. or Chinese regulation
2. An irreversible, fatal flaw in the Bitcoin protocol is discovered
3. A competing cryptocurrency, or other emerging form of money, manages to outpace it in growth and steal its thunder