It is agreed  that last year a lot of people were crazy about bitcoin because its price was very high and a lot of people they have invested in bitcoin and a lot of people they have buy bitcoin with their real money because bitcoin is the only currency which price was high and end of the year bitcoin give a very huge amount of profit to its users so we need to support bitcoin because bitcoin is here to help us and this year bitcoin price will also be high.Indeed 2017 was crazy for bitcoin because it shot up ridiculously high that everyone was going crazy to earn a piece somehow and thats's what eventually kept growing it consistently from time to time. I think it's profound to name 2017 as such.
Well, bitcoin prices are going up crazy in 2017. Times have also changed, the digital era has touched all aspects, as well as the financial world. Bitcoin offers many advantages, can be used as an investment tool, commodity, and means of payment (although not effective because constrained fee and confirmation time).
So many people are getting interested in bitcoin since the price is booming. However, it would be difficult for the bitcoin to replace the fiat, as there are many issues related to legality. In my opinion, bitcoin and fiat will complement each other's flaws, there's nothing to replace each other.