I would like to know if cryptocurrency will replace fiat money in the future, also if so how long it will likely take. Also, I would like to know which coin you think would take over if one will. (E.G. Dogecoin, BTG, LTC, XMR)
I think it's possible, but not in the next 20 years. And when this happens, it will be not Bitcoin. I guess that this coin hasn't been invented yet.