It is possible but to be perfectly honest I don't think it is going to happen in the near future. We all know that Bitcoin is made as a digital currency and not for daily usage, it is here not to replace fiat but who knows, what will happen, We just need to consider the transaction fees and confirmation time, plus the fact that not all establishments are accepting Bitcoin and the government, I don't think they would like the idea, they are already unfriendly to Bitcoin now what more if it will be used as a daily currency, I am sure they will do anything and everything on its power to shut it down. For me it is better for Bitcoin to stay as a digital currency, that way it can still fulfill its purpose without killing fiat that can lead to nothing but chaos.