No he is not wrong.

Bitcoin can't become a unit-of-account for the reasons I just stated. And thus its intrinsic value is that of a money transmitting service, with heaps of irrational speculation on top (because Bitcoin can't do serious things that the masses want and it can't even do serious thing that we enthusiasts need, which is be anonymous so we don't end up in trouble).

We could make him wrong by making it impossible to tax a crypto-currency, but you all don't want to hear that and I don't think you have the balls for that. It wouldn't be for the masses, it would be for us, as the masses tax themselves into the abyss over next several years as socialism collapses.