by 2022? in 6 years? Hardly so...
by 2030 - yes, very likelly.
by 2050 - VERY sure. Not even small doubt. FIAT will be found only in the history books by 2050
... It's hard to predict but I think there is a possibility to be happen because every year has an often changes that we won't be expecting. I think some government and banks are the hindrance or the obstacles of the cryptocurrency because they would like to control the currency. From now on we are still hoping that bitcoin will be continuously propagating to make known to all people so that everyone should know on how to use it.