Agreed, but I think cryptocurrency and blockchain mechanism is the tech forward. Banks across the globe are trying to implement blockchain tech to their systems. Moreover as been in news etc, many governments are about to launch their own cryptocurrency as an alternative to their Fiat currency. Indian government is mulling to launch "lakshmi" currency (goddess of wealth and prosperity). China, Japan & even Kazakistan in the same race as well.

So, in long run, many currencies will die out or merge. and fittest will survive.