If enough places accept digital currencies directly this statement will be false. It is a pretty bold statement. and probably myopic to speak of 'always' as an absolute.
As long as nations require their citizens to pay taxes in fiat, then my statement will always be true. It doesn't matter how many goods or services can be purchased in Bitcoins, Litecoin, Feathercoin or other Crypto-currencies. If income is taxed and taxes are paid in fiat, then you will need to exchange your CC for fiat.
It seems that at this moment compeletely solving the cc to fiat instant change problem is more imperative.
