You can't be serious!! You can't put the genie back in the bottle.  Crypto has morphed into practical applications, and because of this, it isn't going anywhere.  Had crypto just remained as a form of currency, it may not have built longterm staying power.  But, crypto is now so much more than just a dark-web payment system.  Brick and mortar buildings all over the world are starting to accept payment via crypto.  It is becoming more mainstream everyday.