We need more economic freedom; "cryptocurrencies" are not suddenly a panacea to that end. They're still the scam riddled "but this is stupid at its very base" pyramid schemes they were all along.
See the precedent set by Emperor Norton; community currencies and other alternates can work too. What's needed is a government that admits limits to its powers to interfere with its citizens ability to transact. There's no technical means to make a government live up to that promise... Short of explosives.