Cryptocurrencies have proven that we Can transact anonymously without a centralized interference.
The Blockchain has proven that data can be stored in a decentralized public ledger against any form of manipulation.
Smart contracts has proven that two or more people can trust a system in which the assigned contract managing it will be fair to all parties...
When speed, simplicity and efficiency is added to all of this I think decentralization and blockchain technology can go far in the real world as regards adoption.
What do you think of the chances of cryptocurrencies to succeed?.
At present, countries all over the world are developing blockchain technology. This is a great discovery, and the whole world is crazy. But this is not a cryptocurrency, and the promotion and use of blockchains is already determinable. As for whether crypto can successfully replace cash, I think this is very difficult, but there are still opportunities.