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Firstly there is NO other country to ban BTC as of yet so this would be the FIRST.

China stopped accepting it for a while then started again.

Secondly there is a quote that says.... "Overall, the Central Bank’s position is justified. They’re trying to protect the financial system. The main complaint regarding Bitcoin is that there is no backing from any central monetary authority, and they are underpinned only by user confidence that they can make purchases"

This is pretty much what a FIAT currency is. All FIAT currencies are regulated by "the market" which is exactly what BTC does in terms of mining and speculation. All "Power" currencies (dollar, gbp euro, etc) don't have any tangible object (like Gold) backing their value so in reality they're only worth what the "Market" - (you and I say they're worth).

BTC is no different. If my petrol station told me that petrol was 1 BTC per Gallon then that's what it's worth, to me I can use that Gallon of Petrol to go about my day. This is no different from 10 dollars for a Gallon - at some point I have traded my goods (skill, talent, labour, money or whatever) for 10 dollars or 1BTC - the medium (BTC / Dollar) is not relevant. This is a problem for central banks as they need their currency to be relevant in order to keep trade flowing and the corporations happy.