Fiat has been a big help in the society and in the economy, it makes the life easier in a way that is has been our medium of exchange in many things.
So, let us know all forget that, we've been benefited its usage, and I don't think that no one is using fiat nowadays. Although, bitcoin is booming now still fiat exists in many ways.
Someday there will be times that there wont be any paper money anymore. People will still use fiat however it wont be in the form of paper money anymore, there will be times where digital currency took over the payment system and Im not saying bitcoin will be the only one however bitcoin will be one of it