Bitcoin is a digital currency that circulates freely, without any control or supervision from banks, governments, or anyone else. In contrast, bitcoin relies solely on cryptography and software between computers.
what if the government closes or does not allow the exchange of Bitcoin or cryptocurrencies with the official currency in each country?

We could still make use of it directly in p2p .. 1 BTC = 1 BTC and as long there's the demand then we can set our own rules and wont be tending to rely upon fiat currency in towards conversion
but honestly it is really hard to think off for us to go into this situation where bitcoin doesnt really have any fiat monetary value and since it isnt still globally adopted then i
cant really think off about the probabilities of things to happen next.So lets not stressed ourselves in regards to this one.