how are you sure about that?
bitcoin is new and it is the first of its kind. it is the only decentralized money which some people still consider experimental but there is no way of being sure about it ending badly!!! all the evidence points to a better future for bitcoin and continuing stronger than ever in the near future and far future. yes there is also a chance of it ending badly but only a small chance and with all the effort put into improving bitcoin that chance is closer to zero.