No one can have a permanent prediction about the future of a thing or event. Why? Because nothing is permanent in the world. As the world aging, many things are hastily changing also. So maybe, soon cryptocurrency will be more useful. Some new coins will level up and can beat other coins or maybe old coins will be remove. A life of a cryptocurrency depends on the investors of it. as long as there are supporting person who invest in that coin, then the future may be clear as a crystal. But if not, that's the end of a cryptocurrency.