Cryptocurrencies are based on decentralized network. Decentralization means that no institution, government, or any other third party has control on the cryptocurrencies market, value and its volume. The most popular cryptocurrency with the incredible rise in 2017, with more than 10 times, is also the first successful cryptocurrency ever, Bitcoin. The fact that Bitcoin is the first cryptocurrency ever make a lot sense when someone say that Bitcoin adoption rate is rising every minute.
Technology is increasing its progress every day, which mean that cryptocurrencies are getting better every day, involving individuals and institutions into the financial world of cryptocurrencies, making this world easier. Another fact that is increasing adoption rate and the trust in Bitcoin is its security. When we said in the text above that Bitcoin is first successful cryptocurrency, it means that it is first cryptocurrency where coins can\'t be stolen or copied (spent more than once), thanks to cryptographic protocols that are impossible to be cracked, with the technology that we have today. But future quantum computers could be a danger for cryptocurrencies.
There are some possible answers to these issues, for example some of the public-key schemes are resistant to the attack of quantum computers. But for now Bitcoin is not planning on revising security protocols most for the reason that quantum computers are still not a threat in reality, but for 10 maybe even 20 years, quantum computers could become reality which will increase the pressure on Bitcoin to change its security protocols. There is a question of how secure everything would be with the threat of quantum computers. Guess we have to wait for the answers.