I call Bitcoin a gem. Because once paper money will have no value. The only reason behind not having the price of paper money. People's interest is changing day by day. Now people are leaning towards digital transactions. Now no one wants to do cash transactions. That is why the importance of cryptocurrency has increased a lot.
Bitcoin is a currency. Which you can use it for any purpose at any moment in any place. Just one transaction. In my opinion, the government of every country should give legitimacy to cryptocurrency. Has already given legitimacy from many countries.
Yeah many people claimed that already for many of years, even by its creation from 2009, some could've said the same already.
As what you mentioned about it getting legalized, many countries did it already. Some are still neutral to it though and some , on the other side, banned it for some safety reason of their citizen.