One way or the other, most of the government will have to adapt themselves for using cryptocurrencies. Physical currencies days are pretty much over. Governments will be forced to move to digital currencies.
Big banks and corporations (and some governments) strongly appose digital currencies because they reap the rewards of transaction costs on normal card transactions and i guess they want a monopoly on payment processors
but youre totally right, if digital currencies become widespread in use; governments will have no choice! theres no stopping users from using bitcoin
