Yeah! Sure. I think cryptocurrency will be the future of currency because it's already happening.
And I don't just mean in a speculative sense—people are actually using cryptocurrencies as currencies, and they're not just speculating on whether or not it'll work out. You can buy things with bitcoin at Overstock, Microsoft, and even Amazon. You can use Ethereum to pay for gas at gas stations in Europe. And you can pay your bills with Litecoin on BitPay.
These are all examples of how cryptocurrency is being used as a currency right now: people are using them to purchase goods and services, to pay their bills, and to send money to friends and family overseas. That's why I think they'll become the future of currency—because they're already here.