Except for 3 countries, every nation in the world has a central bank. There used to be more, but somehow these countries get a color revolution and soon after a central bank appears. And the central banks have the BIS (Bank for International Settlements) referred to as the central bank of central banks. That is centralized control.
Maybe the decentralized systems will do some damage to that power, but I am confident that none of us will live long enough to see it happen in our lifetime. As for them losing that power, I think they will scorch the entire planet before they would let that happen. In a wide war scenario, one will not have the means and interest to develop code.