Bitcoins have three useful qualities in a currency, according to The Economist in January 2015: they are "hard to earn, limited in supply and easy to verify". Economists define money as a store of value, a medium of exchange and a unit of account, and agree that bitcoin has some way to go to meet all these criteria.
Yes bitcoin has a long way run in order to meet those criteria which is those three, but the fact that bitcoin has the criteria of hard to earn in which it is very hard to earn 1 bitcoin because the value of it is kind of high and we also know that bitcoin is only have a limited supply meaning there is only a few of bitcoin that is revolving all over the world the thing is, bitcoin and other cryptocurrency are almost there we just need to wait in order to see what it can do to the economy of a country. And because of that we can say that bitcoin is really good for the economic growth of a said country.
Imo bitcoin lacks of 1 highly needed quality of currency is usability. At this point bitcoin is volatile and so is a thing to gamble around, so its not a good investment either