Its high value is based on the limited circulation mostly, imo, it makes no difference to stamp valuation. That doomed it can't be a flat money, but only for collection, maybe to someone who's favorite of collection.
Moreover, the flat money is endorsed by a country's credit, not by an individual or a corporation. Unless the country goes bankrupt.
Now I still believe an innovation will come, so, I kept an eye on BTC since Y2016, but only because it is a beginning.
But if the money being exchanged to BTC....