Like I've said in other threads, anyone that thinks the major world governments are going to give up the power that comes with their printing presses have a poor grasp on how government and politics work.
95% of what a US Congressman or Executive Branch member does is related to controlling and distributing how money that is printed by the US Treasury.
All they have to do is label these crypto currencies as criminal money laundering schemes or banking for terrorists and it's all over for them.
That will happen if these things ever become even remotely main stream, which is what it would take to bid up the price to where most BTC lovers think it's headed.
Well, I've said in other threads that Innovation is the leading force. Innovation brings progress and wealth, and this is very well known by governments, especially the USA government. Just Google "Bit License" and learn where New York is working on, to fully legalize and promote crypto-currency Innovations. This will bring Bitcoin to a mean-stream level, and other countries will follow.