Yesterday you were complaining that that if everyone transacted in crypto the money supply would be deflationary; today you are insisting no-one will want to hold crypto assets because of volatility. Yesterday you were comparing crypto to the gold standard; today you are suggesting that all economic activity prior to Bretton Woods was "barter" (as if that is an argument!). And then it is clear you haven't even read my previous comment, which explicitly states that cryptocurrency is non-problematic so long as prices continue to be denominated in a non-deflationary asset -- so of course taxes need to continue to be paid in fiat.
So I'll stick to my earlier observation: if you want to understand how crypto will intersect with the fiat economy you need to go back and read Keynes on the causes of liquidity traps, and then work forward from first principles. You don't see it now because -- like Krugman -- you think you are arguing against the Gold Standard. But the Gold Standard is irrelevant: in practice the only question that matters from a macro perspective is to what extent fiat-denominated activity will shrink as crypto-adoption spreads, and whether the manner in which crypto is adopted translates into wage and price rigidity across the economy as a whole. If your generation of macroeconomists do not or cannot understand this, the next ones will.