In my opinion it will take times to happen or maybe its impossible to legalized. All of country have a legal fiat and they have follow their own laws in implementing the adaptation of new currencies entering in their custody. The fact is bitcoin is hard to legalize because of status in economic growth of one country. The situation bitcoin can't contribute the economic system of one nation. Also bitcoin is anonymous and the used of this is through internet. Another thing is there are a lot of hindrances to legalized it and some country can't accept or adopt bitcoin.