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)
Yes it could happened someday in the future if cryptocurrency keep used by peoples around the world.
but for now, crypto still cannot fully replace fiat money because the price of crypto still easy to change and not stable enough.