How will govern-cements adopt block-chain?
A little at first, then all at once, with a gun to their heads!
Govern-cements will be demanded to be more and more transparent. And if they don't do it themselves, then someone in the community will do it for them. They will be put on the block-chain for all to see.
The trouble with bureaucracies is that they are very very slow to move. And so, if they began, right now, in earnest, to make a bitcoin like FED controlled currency, by the time they implemented it, bitcoin would have changed into something 10x better. (so slow, maybe 100x better)
And, basically, they will want to collect tax on every transaction, so their system would have super high transaction rates. Super high inconvenience. It would be like the DMV of block chains.