I think it depends on the place. It seems that Prague is the place that bitcoin is most used. Granted, they still don't use the Euro. I think it will depend on each country as to what they choose, and how hard they embrace bitcoin or fight against it. I can't imagine a country like China allowing bitcoin anytime soon. I do think, the more left a state is, the less likely they will be willing to allow bitcoin to be free. I also think Trump actually wants the USD to be lower in value, so that the US can bring manufacturing back and export things. I can see bitcoin overtaking the local currency in some places and in other places, being more like gold, being seen as a store of value and a reserve asset.