Digital currencies are too young to be thought of as a failure. I think the future is full of countries accepting cryptos and to the last time when the last man accept and use crypto in their daily transaction. Crypto has come to stay and it is backed by a system that is trusted. I perceive mass adoption of crypto in the next 2 years. Everyone will see the positive side of crypto soon.
Yes, they are. Most people even do not know about the existence of the majority of altcoins. However, many of these projects will be developing. I see they have a very good future, but we have to wait for it.