I definitely agree, If country's follow suit to sustain power in fiat currency it would be devastating. That being said the nature of bitcoin and crypto currencies alike may loose much of its value in the downfall but i would still bet that these currencies will remain whether or not governments like it. The very nature of the technology cant be stopped.Its already in circulation and there will always be a demand for untraceable currency. No one can stop me from going to someone who has bitcoin and handing them the cash for bitcoin. Im sure the regulation would cripple crypto currencies monetary value but it will still be useful and there will always be a market. You can make a hammer worthless in monetary value but it can still hammer nails. You can make crypto value drop but its use is the same. I also wouldn't mind the market going "black". That all in mind I really really hope that governments dont put such regulations cause the growth of crypto can only be good. obviously in my opinion. If all money was centralized then the world would be much more interesting.