I was not aware of Snowden's life, but after searching about him I got the value of his words, he might not have a big voice among traditional people especially due to the tension between Russia and America, well keeping them aside, I also think bitcoin is the significant monetary system. From a centralized system to a decentralized one, where people have the full freedom of their funds, they are responsible for their own funds, they can keep them safe as long as they want.
There are a lot of benefits of BTC over traditional coins, (currently notes) but due to some limitations, it can't be adopted like these coins (notes), As the fee in itself is so high that it might cross the cost of goods and services. So how could it replace the old fiat system, there are more limitations to BTC which might be solved in the future but till then it can't be as significant as the traditional fiat system is, both have their own pros and cons.