That day isn't here yet, and it's not coming soon — but it is coming.

The advantages of cash are a) it can be used for micropayments and b) it's anonymous. Those are also the advantages of crypto-assets. At some point in their adoption, it will become less unusual to use these instead of paper money, and then paper money will begin to look like the more sordid option.

At that point, they will be true crypto-currencies. Until then, I'll keep calling them crypto-assets.