100% impossible because bitcoin is not accepted by all countries and there are many country which are against bitcoin. and bitcoin is not the safest form of money because it has limit of 21 million so this would definitely cause crisis.
Anyone can actually use bitcoin in any country as long as there's an internet connection. I haven't heard someone getting arrested because he used bitcoin in this forum or maybe I just haven't done research about it. Bitcoin is just not banned at all. Government just say that it's an unregulated currency and I don't hear in the news government officials talking about bitcoins.
If bitcoin didn't have that limit in its quantity, then I'm sure that 1 bitcoin would cost much less than what it is right now. It's a good thing that there would only be 21 million of them after all of the coins is in regulation because that would create scarcity and scarcity creates value.