Most people still don't understand computers, but they're easy to use and relatively predictable, although security is still a big problem.

The thing about currency is that if people lose their money they might suffer and die. So it should be easy enough to understand that they can't easily be ripped off, and transparent enough that nobody can accumulate system-changing quantities without that being pretty obvious to everyone else. I've been interested in Bitcoin for years but understanding the Bitcoin ecosystem seems like a full-time job. You can't have an economy entirely based on financialization and trading, and if the people who specialize in handling the currency are sure to end up with the largest amounts of it then it's hardly better than what it's replacing.

I'm not saying there should be no rewards for specializing in currency work, but I'd like to see some sort of self-limiting mechanism. I'm reminded of a humorous Stanislaw Lem story in which a wicked king is tricked into replacing all the currency in the kingdom with uranium coins, so that his insatiable desire to accumulate as much as possible in the royal treasury eventually leads to criticality and his subsequent destruction.