I thought that Bitcoin might become one of the currencies used by people when the fiat systems collapse, but I think this will only be a minor use. I believe that fiat cash will be used for a while, and silver coins could become a longer term solution. Of course it all depends on the cryptos that are introduced by the various governments, and whether there will be any trust in them.
Fiat has a strong power over bitcoin and other digital currencies because it is centraized and under government's system. For now, bitcoin is not fully used as country's alternate currency as expected by many. Let's admit it, it is widely use as a store value and/or investment and not digital currency as it is.