I take a more optimistic view. Digital currencies seem to be perfectly suited to transactions where corruption is rampant. Take the construction industry. There

I take a more optimistic view. Digital currencies seem to be perfectly suited to transactions where corruption is rampant. Take the construction industry. There is poor chain-of-custody and a lot of counterparty trust involved, so things disappear and the mafia gets richer. I don't want the construction industry to have great privacy standards, I want it to be transparent. So digital currency can absolutely be bad for privacy and a boon in certain spaces, specifically ones where trust is commonly abused. Cash can still exist in industries where we want trust to exist between different parties, those kinds of spaces are small enough that I doubt they'd be worth the effort to eradicate anyway. Not to say that I like where all of this is going myself, but blockchain for large and official transactions + metal currency for local informal transactions is one direction I wouldn't mind at all.