I can't imagine how Bitcoin can be the currency of a country when it's decentralised and mined worldwide. The country needs a centralised currency to have control on it, to do different monetary polices and have some level of control on it. Since Bitcoin is decentralised and worldwide, it's a very bad choice for any country. Also, Bitcoin doesn't have a cash version, which makes it very impractical and unusable. Using of Bitcoin is not one of the easiest thing, transactions are also slow and sometimes expensive, you need to wait for a few minutes and sometimes up to an hour or a little bit more to get your transaction confirmed and for 3 or six confirmations, sometimes you need to wait longer.