"a viable digital fiat currency"
We already have that. It's called a credit card.
I fail to see the interest in having a national funny coin. The single good side that it might have is denting the prolific activity of criminals and incompetents in so-called "exchanges", where the only thing that is really going on is the ticking of the time bomb that is counting away the seconds until data is stolen, coins are lost or somebody makes a getaway with the money.
If that sort of activity can be curbed, then so be it, but don't tell me that my fiat currency I use almost every day is not almost completely virtual.
Hell, there are enough people complaining that the entire banking and financial world is based on a sham. All those who want to reintroduce gold-based monetary values, for starters.