If it's not the authorities this time you can be sure that it won't be long before a collection of governments and banks will try to prevent people from transferring money to
BTC exchanges. It is only a matter of time before there will be a run on banks and when that happens of course the governments will try to stop the inevitable because they own/are owned by the banks.
When this happens smaller time money exchangers at localbitcoin, banks in dodgy tax havens and ripple will be the name of the game.
In effect that would be great for
BTC because it will facilitate it to stop being valued in dollars and it will finally get a value of its own (of course most people here knows it in reality already has this (ridiculously high) value not represented by the cheap price in dollar terms).