For those who argue that Bitcoin and other cryptocurrencies are the next big things, buying and investing in Bitcoin might just pay off. Bitcoin might excel if currencies like the dollar et al trips under a hyperinflation scenario but that for now is not visibly an option that is available, thus, another fundamental question is wether Bitcoin can replace normal currencies and that again is not feasible in the nearest future. Why then should people invest in or buy a currency that can rise or fall by 20 percent in an hour or two?
Bitcoin can not replace fiat. It is an option of the people to invest their money because they are knowledgeable enough and understand the trending of business in the blockchain technology in this digital world. Bitcoin brought ultimate change in every one's life for those who are engaged in this technology and I believe that is remain to be the best transaction system in the future.
But if the governments will adopt this coin for their state affairs and if the bigger businesses will adopt this coin for their businesses and they will prefer only this coin to be used and if the traders will be doing dealings only in this coin and it will become a global currency then it is possible that bitcoin will replace fiat and tn at that time fiat will be considered as the currency of past and bitcoin will be considered as the modern currency.