Governments and banks want different blockchains. Blockchains that'd make Orwell cry in a corner. Sure we'll get government issues cryptocurrencies: CRYPTOFIAT. All your transactions will be traced, monitored and taxed automatically.
Of course, they'll make exceptions for certain individuals...
yeah this is what scares me too. "fedcoin" will replace the fiat currency and they will track your purchases and keep people in their place. fortunately i think there's ways to make sure the gov doesn't know what you buy and such