I think that approximately 3-4 years will be needed in order to regulate the status of the crypto-currency in the world economy and to introduce them into the lives of ordinary consumers. The more goods and services you can buy for crypto-coins, the more coins will have real supports. And the more well-known, the goods and services will be in demand, the stronger will be the support. The same applies to the system of use. If there are large and reliable systems for exchange, input-output, then the crypto-currencies have a chance to quickly penetrate into the life of an ordinary person and secure stability.
Of course, cryptocurrency eventually has to go to the general public's attention and guide it to ordinary people's lives, which can reflect its value. A thing needs to be approved by the majority of people and can be widely used.