Vitalik Buterin says only about the probability that crypto currencies can have a value near zero, but this probability is extremely small. With the same probability, we can say that tomorrow the meteorite will hit the ground and we all will perish. Crypto currency will lose its value only when people absolutely all lose any interest in crypto currencies. The same can happen with the antiquarian and works of art, for example, if the paintings of Picasso, Rembrandt and other artists cease to be necessary for people, then their price will drop to zero and they will not be stored in museums, but in someone's loft in dust. We give the value of the crypto currency ourselves, as a community. Look at Dashcoin, its price has risen from $ 0.5 per coin to $ 1500 this year, this is an increase of 300,000%, and this is all thanks to the Dashcoin community, which is constantly evolving and popularizing its coin. This is just one example, but hundreds of such examples can be cited. Therefore, you should not treat such statements as predicting future crypto currencies, learn to think critically and study technology that is behind different crypto currencies.