That sounds lovely in theory, but once you get to an exchange of value, you cross the line into taxable territory, and will have to exchange something for fiat currencies.

Sure, most minor barter transactions are ignored as de minimus, but that does not make it legal (i.e., not tax evasion).

So paying your neighbor for a loaf of her home baked bread with a wad of coupons for the local store (or Satoshis) is probably ignored because she is not an official business, but if you do the same at the store, or she grows to anything beyond casual home cooking, the store and your neighbor will need to pay both sales tax and income tax - in fiat - on those transactions.

Same goes for us trading anything large, say we barter my car for your boat (or a bunch of BTC, gold, gift cards or whatever), we'll have to pay taxes on the transaction, in fiat. And we may have the additional pleasure of needing to get an appraisal too.

So the idea that crypto currency could never touch fiat was never anything more than a lovely figment of the internet imagination.