Set aside the investment craze in the crypto world and let's go back to the essence of cryptocurrencies for a while. I prefer to think of cryptocurrencies as a form of payment with a lower transaction cost comparing to other forms of payment we currently use on a daily basis. The reason for voices against cryptos I believe is because it's human nature for people to resist things that they are not familiar with. As long as we allow cryptos time to develop, there is no reason to believe that people would give up on sth that has lower cost and more efficient.