If they are combined, that's great because in countries where bitcoin is not acceptable, maybe this combination might change them.
It is next to impossible to combine both of them as they has totally change features and totally change use, we can take good advantages with the crypto as compare to the fiat, as we know fiat currency has been using since long but it is not that worth which can beat the value of bitcoin, so I think if we talk about value bitcoin is going to have higher value than fiat.