It will never happen. It will go down in the market but it will never gonna be dead. Cyrptocurrency is an advance technology that just being introduce in the world slowly. But now many of us are aware of it. We are using it in convenience in our daily life. Digital currency is making its on way on the real world. Developers are keep on improving their project just to make sure that cyrptocurrecies will be the most easiest way to buy,pay our daily life. Example for this is the https://redcab.co it is a good project saying that it is more accessible and convenient for us to ride a cab or commute everyday that we dont need cash in our hand but a cryptocurrency in our virtual wallet.