More software can be written to link bitcoin ledger to the real world events and alter the supply dynamics ..as central banks do against bonds ..but that will defeat the purpose .. plus being digital gold is far better than being a digital currency ..

The role of a central bank is to provide a foreign power the means to steal from an otherwise sovereign nation without direct military conflict through seigniorage and usury.

You're referring to a state bank, which is different from a central bank.